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Share based compensation arrangement by share based payment award deferred cancellations in period. Share based compensation arrangement by share based payment award deferred cancellations in period. 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Treasury stock, at cost — 579,422 and 840,899 shares as of June 30, 2024 and June 30, 2023, respectively Treasury Stock, Value Entity Voluntary Filers Entity Voluntary Filers Construction in progress Construction in Progress, Gross Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Utility and Power Infrastructure Capital Project 1 [Member] Utility and Power Infrastructure Capital Project 1 [Member] Utility and Power Infrastructure Capital Project 1 Total Deferred Income Tax Expense (Benefit) Carrying value of goodwill by segment Schedule of Goodwill [Table Text Block] Property, Plant and Equipment Disclosure Property, Plant and Equipment Disclosure [Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Selling, general and administrative expenses Selling, General and Administrative Expense Contribution made by company Defined Contribution Plan, Cost Defined Contribution Plan, Cost Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Share awards authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Loss on Contracts Loss on Contracts Document Fiscal Period Focus Document Fiscal Period Focus Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Change in uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount June 30, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two International [Member] International [Member] International. Assets Assets [Abstract] Multiemployer Plans Type [Domain] Retirement Plan Type [Domain] Pro-rate of original awards maximum Payout As Percentage Of Original Award Maximum Payout as percentage of original award maximum. 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Three Month Tenor Asset Backed Credit Facility Adjusted Term SOFR Rate Three Month Tenor Other international [Member] Other international [Member] Other international [Member] Land Buildings And Improvements Gross Land Buildings And Improvements Gross Land Buildings And Improvements Gross Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] National Electrical Benefit Fund, Local 488 and 126 [Member] National Electrical Benefit Fund, Local 488 and 126 [Member] National Electrical Benefit Fund, Local 488 and 126 [Member] Auditor Firm ID Auditor Firm ID Net cash provided (used) by investing activities Net Cash Provided by (Used in) Investing Activities Operating loss Operating loss Operating Income (Loss) Restrictions on Cash and Cash Equivalents [Table] 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Joint Pension Fund Local Union One Six Four Ibew [Domain] Joint Pension Fund Local Union One Six Four Ibew [Member] Joint Pension Fund Local Union One Six Four Ibew Name of Property [Domain] Name of Property [Domain] Inventories Inventory, Net Assumptions used to calculate grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Entity Address, State or Province Entity Address, State or Province Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Local 351 IBEW Pension Plan [Member] Local Three Five One Ibew Pension Plan [Domain] Local 351 Ibew pension plan. 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Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement, Maximum Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement, Maximum Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement, Maximum Transportation Equipment Gross Transportation Equipment Gross Transportation Equipment Gross Foreign currency translation adjustments, tax effect Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Business Segments [Axis] Segments [Axis] Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense Property, Plant and Equipment [Abstract] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Significant components of the Company's deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Earnings per Common Share Earnings Per Share [Text Block] Treasury Shares Sold to Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Subsequent Event [Member] Subsequent Event [Member] Percentage of limitation on pretax compensation Defined Contribution Plan Maximum Annual Contribution by Employee Percent Maximum percentage of employee gross pay, by the terms of the plan, that the employee may contribute to a defined contribution plan. Operating Loss Carryforwards Operating Loss Carryforwards Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Stockholders' equity: Equity, Attributable to Parent [Abstract] Weighted average grant date fair value per share granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Name of Property [Axis] Name of Property [Axis] Income Taxes Income Tax, Policy [Policy Text Block] Segment [Domain] Segments [Domain] Vest in 2025 [Member] Vest in 2023 [Member] Vest in 2023 [Member] Pro-rate of original awards, minimum Payout As Percentage Of Original Award Minimum Payout as percentage of original award minimum. Cash Performance Awards Cash Performance Awards [Member] Cash Performance Awards Building [Member] Building [Member] Description of plans funded Description of Funded Portion of Plan Description of funded portion of plan. 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Segment Information Segment Reporting Disclosure [Text Block] Repurchase of common stock for payment of statutory taxes due on equity-based compensation Payments for Repurchase of Other Equity Deferred shares vested and released Share Based Compensation Arrangement By Share Based Payment Award Deferred Shares Vested And Released Share based compensation arrangement by share based payment award deferred shares vested and released. Employee Award [Member] Employee Award [Member] Employee Award. 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Statement [Table] Statement [Table] Change in net contract balances Change in net contract balances Change in net contract balances from the prior year to the current year. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Utility and Power Infrastructure Project 3 [Member] Utility and Power Infrastructure Project 3 [Member] Utility and Power Infrastructure Project 3 Schedule of sources of pretax income (loss) Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Consolidation Items [Domain] Consolidation Items [Domain] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Auditor Location Auditor Location Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Contributions to other multiemployer plans Multiemployer Plan, Pension, Insignificant, Employer Contribution, Cost Shares available at ESPP Employee Stock Purchase Plan Maximum Number Of Shares Available For Issuance Employee stock purchase plan maximum number of shares available for issuance. 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Debt Debt Disclosure [Text Block] Geographical [Domain] Geographical [Domain] Contract receivable in dispute Contracts Receivable, Claims and Uncertain Amounts Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Significant components of the Company's deferred tax assets and liabilities as reported in the Consolidated Balance Sheets Schedule of Components of Deferred Tax Assets and Liabilities Net [Table Text Block] Schedule of components of deferred tax assets and Liabilities, net. Amount of non-deductible goodwill impaired. Amount of non-deductible goodwill impaired. Amount of non-deductible goodwill impaired Entity Address, Postal Zip Code Entity Address, Postal Zip Code Zone Red [Member] Zone Red [Member] Zone Red [Member] Zone red. Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common stock—$.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of June 30, 2024 and June 30, 2023; 27,308,795 and 27,047,318 shares outstanding as of June 30, 2024 and June 30, 2023, respectively Common Stock, Value, Issued Foreign tax credit carryforwards Foreign tax credit carryforwards [Member] Foreign tax credit carryforwards Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement Asset Backed Credit Facility Fixed Charge Coverage Ratio Requirement Customer Based [Member] Customer based [Member] Customer Based [Member] Customer based member. Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Restricted Stock or Unit Expense Restricted Stock or Unit Expense Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] 5E Boron Americas, LLC Mining and Minerals Project [Member] Mining and Minerals Project Treasury Stock, Common, Value Other Treasury Share Purchases Other treasury share purchases. Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents, at Carrying Value Warranty reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Disclosure Customer Contracts Additional Information [Abstract] Disclosure Customer Contracts Additional Information [Abstract] Disclosure - Customer Contracts - Additional Information [Abstract] Income (Loss) Attributable to Parent, before Tax Income (Loss) Attributable to Parent, before Tax Other intangible asset impairments Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Auditor Name Auditor Name Foreign currency translation and other Deferred Tax Assets, Other Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Multiemployer Plans [Line Items] Multiemployer Plan [Line Items] Tax Credit Carryforward, Description Tax Credit Carryforward, Description Weighted average grant date fair value per share cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Depreciable life of PP&E Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Stock option activity and related information Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Total deferred tax liabilities Deferred Tax Liabilities, Gross Basic loss per common share Basic loss per common share (in dollars per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Excess tax expense (benefits) related to stock compensation vesting Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Operating lease payments Operating Lease, Payments Purchases of property, plant and equipment on account Capital Expenditures Incurred but Not yet Paid Schedule of Goodwill [Table] Goodwill [Table] Federal tax credits Federal tax credit carryforwards [Member] Federal tax credit carryforwards Loss Contingency [Abstract] Loss Contingency [Abstract] Total current liabilities Liabilities, Current Machinery and Equipment, Gross Machinery and Equipment, Gross Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Total assets Assets Assets Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets [Abstract] Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets June 30, 2025 Finite-Lived Intangible Asset, Expected Amortization, Year One Cost of revenue Cost of Goods and Services Sold Charges without tax benefit Income Tax Reconciliation Charges Without Tax Benefit Income Tax Reconciliation, Charges without tax benefit Borrowings under asset-backed credit facility Long-Term Line of Credit Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Income taxes receivable Income Taxes Receivable, Current Capital expenditures Payments to Acquire Property, Plant, and Equipment Other liabilities, non-current Other Liabilities, Noncurrent Proceeds from Legal Settlements Proceeds from Legal Settlements Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Reconciliation between the expected income tax provision applying the domestic federal statutory tax rate and the reported income tax provision Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Office Equipment and Capitalized Computer Software Gross Office Equipment and Capitalized Computer Software Gross Office equipment and capitalized computer software gross. Borrowing Base Minimum During Year Borrowing Base Minimum During Year Borrowing Base Minimum During Year Revenue Revenues Fiscal 2026 Lessee, Operating Lease, Liability, to be Paid, Year Two Accrued insurance Accrued Insurance, Current Change in Shares Available Under Plan Change in Shares Available Under Plan Change in Shares Available Under Plan Entity Address, City or Town Entity Address, City or Town Leases Lessee, Leases [Policy Text Block] Carrying value of other intangible assets Schedule Of Intangible Assets Excluding Goodwill Table [Table Text Block] Schedule of intangible assets excluding goodwill. Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Net income (loss) Net Income (Loss) Attributable to Parent Director Awards [Member] Director Awards [Member] Director Awards [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Shares cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Loss Contingencies [Table] Loss Contingencies [Table] Additional Margin on Adjusted Term SOFR, Minimum Additional Margin on Adjusted Term SOFR, Minimum Additional Margin on Adjusted Term SOFR, Minimum Multiemployer Plan, Employer Contribution, Cost Multiemployer Plan, Pension, Significant, Employer Contribution, Cost Finite-Lived Intangible Assets by Major Class [Axis] Business Acquisition [Axis] ABL Borrowing Base Line of Credit Facility, Current Borrowing Capacity Foreign Tax Authority [Member] Foreign Tax Jurisdiction [Member] Alternate Base Rate Margin Alternate Base Rate Margin Alternate Base Rate Margin Entity File Number Entity File Number Total contributions made Multiemployer Plan, Employer Contribution, Cost Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Federal Current Federal Tax Expense (Benefit) Entity Address, Address Line Two Entity Address, Address Line Two Severance costs and other benefits Severance Costs Bakersfield Facility Purchase Bakersfield Facility Purchase [Member] Bakersfield Facility Purchase Operating lease term (up to) Lessee, Operating Lease, Term of Contract Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Weighted-average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Document Period End Date Document Period End Date Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Contract Receivable Retainage, after Next Twelve Months Construction Contractor, Receivable, Retainage, after Year One Total future operating lease payments Lessee, Operating Lease, Liability, to be Paid Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Nonvested shares at June 30, 2022 Nonvested shares at June 30, 2023 Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share Based Performance Awards Share Based Performance Awards [Member] Share Based Performance Awards Fiscal 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three Intellectual Property [Member] Intellectual Property [Member] Intellectual Property [Member] Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Document Transition Report Document Transition Report Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Holdback receivable Holdback receivable Amount receivable from acquirer of our industrial cleaning business. Customer [Domain] Customer [Domain] Entity Current Reporting Status Entity Current Reporting Status Line of Credit Facility, Initiation Date Line of Credit Facility, Initiation Date Retained Earnings Retained Earnings [Member] Retained Earnings [Member] Basic (in shares) Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Utility and Power Infrastructure Member Utility and Power Infrastructure Member [Member] Utility and Power Infrastructure Member Proceeds from asset sales (Note 3) Proceeds from Sale of Productive Assets Schedule of Segment Reporting Information, by Segment [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Total stockholders' equity Balances, beginning Balances, ending Equity, Including Portion Attributable to Noncontrolling Interest Other Treasury Shares Acquired Other Treasury Shares Acquired Other treasury shares acquired. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Significant components of the Company's deferred tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Revenue Benchmark [Member] Revenue Benchmark [Member] Components of the provision for income tax expense (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Average grant date fair value Share Based Compensation Arrangement By Share Based Payment Award Deferred Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Deferred Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award deferred weighted average grant date fair value. Entity Filer Category Entity Filer Category Time-and-materials Contract Time-and-Materials Contract [Member] Burlington Office [Member] Burlington Office [Member] Burlington Office Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items]