Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable, less allowances (September 30, 2012-$1,906 and June 30, 2012-$1,201) Accrued Income Taxes Current Income taxes payable Accrued Insurance Current Accrued insurance Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Accumulated depreciation Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax Accumulated other comprehensive income Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Acquired Indefinite Lived Intangible Assets [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Additional Paid In Capital Additional paid-in capital Additional Paid In Capital [Member] Additional Paid-In Capital Adjustments Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided (used) by operating activities: Adjustments To Additional Paid In Capital Other Issuance of deferred shares (106,394 and 40,787 shares for years 2012 and 2011 respectively)) Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Stock-based compensation expense Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation Tax effect of exercised stock options and vesting of deferred shares All Other Segments [Member] Other [Member] Allowance For Doubtful Accounts Receivable Current Accounts receivable, allowances Amendment Flag Amendment Flag Amortization Of Intangible Assets Amortization expense Amount of limit on asset dispositions. Amount Of Limit On Asset Dispositions Limit on asset dispositions Amount of limit on Canadian dollar borrowings. Amount Of Limit On Canadian Dollar Borrowings Sublimit on Canadian dollar borrowings Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Total antidilutive securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Assets Segment assets Total assets Assets [Abstract] Assets Assets Current Total current assets Assets Current [Abstract] Current assets: Balance sheet. Balance Sheet Shown on balance sheet as: Billings In Excess Of Cost Billings on uncompleted contracts in excess of costs and estimated earnings Buildings And Improvements Gross Land and buildings Business Acquisition Contingent Consideration At Fair Value Current Acquisition payable Capacity constraint due to the Senior Leverage Ratio. Capacity Constraint Due To Senior Leverage Ratio Capacity constraint due to the Senior Leverage Ratio Capital Expenditures Incurred But Not Yet Paid Purchases of property, plant and equipment on account Cash And Cash Equivalents At Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net decrease in cash and cash equivalents Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Commitments And Contingencies Commitments and contingencies Commitments And Contingencies Disclosure [Text Block] Commitments and Contingencies Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Common Stock [Member] Common Stock Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Value Common stock-$.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of September 30, 2012, and June 30, 2012 Comprehensive Income Net Of Tax Comprehensive income Consolidated earnings before interest taxes depreciation and amortization per credit. Consolidated Earnings Before Interest Taxes Depreciation And Amortization Per Credit Agreement Consolidated EBITDA as defined in the Credit Agreement Consolidated Funded Indebtedness Consolidated Funded Indebtedness Consolidated funded indebtedness Consolidated fund indebtedness limit. Consolidated Fund Indebtedness Limit Consolidated funded indebtedness limit Construction In Progress Gross Construction in progress Contract Receivable Retainage Due In Remainder Of Fiscal Year Billings in accounts receivable to be collected within one year Contracts Receivable Claims And Uncertain Amounts Estimate of the remaining amount to be collected Contracts Receivable Claims And Uncertain Amounts Expected To Be Collected In Next Rolling Twelve Months Additional claim for amounts due under related contract Cost Of Services Cost of revenues Costs In Excess Of Billings On Uncompleted Contracts Or Programs Total Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected After One Year Contract retentions collectible beyond one year Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Costs and estimated earnings in excess of billings on uncompleted contracts Credit Agreement Term Credit Agreement Term Credit agreement Current Fiscal Year End Date Current Fiscal Year End Date Customer based member. Customer Based [Member] Customer Based [Member] Debt Disclosure [Text Block] Debt Deferred Income Tax Expense Benefit Deferred income tax Deferred Shares Issued Deferred Shares Issued Issuance of deferred shares, shares Deferred Tax Assets Net Current Deferred income taxes Deferred Tax Liabilities Noncurrent Deferred income taxes Depreciation Depletion And Amortization Depreciation and amortization Disclosure - Antidilutive Securities Excluded from the Calculation of Diluted EPS [Abstract] Disclosure Antidilutive Securities Excluded From Calculation Of Diluted Eps [Abstract] Disclosure - Antidilutive Securities Excluded from the Calculation of Diluted EPS [Abstract] Disclosure - Availability Under the Senior Credit Facility [Abstract] Disclosure Availability Under Senior Credit Facility [Abstract] Disclosure - Availability Under the Senior Credit Facility [Abstract] Disclosure - Carrying Value of Goodwill by Segment [Abstract] Disclosure Carrying Value Of Goodwill By Segment [Abstract] Disclosure - Carrying Value of Goodwill by Segment [Abstract] Disclosure - Carrying Value of Other Intangible Assets [Abstract] Disclosure Carrying Value Of Other Intangible Assets [Abstract] Disclosure - Carrying Value of Other Intangible Assets [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract] Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract] Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract] Disclosure - Customer Contracts - Additional Information [Abstract] Disclosure Customer Contracts Additional Information [Abstract] Disclosure - Customer Contracts - Additional Information [Abstract] Disclosure Debt Additional Information [Abstract] Disclosure Debt Additional Information [Abstract] Disclosure Debt Additional Information [Abstract] Disclosure - Gross and Net Amount of Uncompleted Contracts [Abstract] Disclosure Gross And Net Amount Of Uncompleted Contracts [Abstract] Disclosure - Gross and Net Amount of Uncompleted Contracts [Abstract] Disclosure - Intangible Assets Including Goodwill - Additional Information [Abstract] Disclosure Intangible Assets Including Goodwill Additional Information [Abstract] Disclosure - Intangible Assets Including Goodwill - Additional Information [Abstract] Disclosure - Results of Operations [Abstract] Disclosure Results Of Operations [Abstract] Disclosure - Results of Operations [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Information [Table] Document Information [Table] Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share Basic Basic earnings per common share Basic EPS Earnings Per Share Basic [Abstract] Basic EPS: Earnings Per Share Diluted Diluted earnings per common share Diluted EPS Earnings Per Share Diluted [Abstract] Diluted EPS: Earnings Per Share [Line Items] Earnings Per Share [Line Items] Earnings Per Share [Line Items] Earnings Per Share [Table] Earnings Per Share [Table] Earnings Per Share [Table] Earnings Per Share [Text Block] Earnings per Common Share Effect Of Exchange Rate On Cash And Cash Equivalents Effect of exchange rate changes on cash Electrical infrastructure. Electrical Infrastructure [Member] Electrical Infrastructure [Member] Employee Related Liabilities Current Accrued wages and benefits Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Equity Component [Domain] Equity Component [Domain] Excess Tax Benefit From Share Based Compensation Financing Activities Excess tax benefit of exercised stock options and vesting of deferred shares Finite Lived Intangible Assets Accumulated Amortization Accumulated Amortization Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2013 Finite Lived Intangible Assets Amortization Expense Year Five 2017 Finite Lived Intangible Assets Amortization Expense Year Four 2016 Finite Lived Intangible Assets Amortization Expense Year Three 2015 Finite Lived Intangible Assets Amortization Expense Year Two 2014 Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Gross Gross Carrying Amount Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Net Net Carrying Amount Finite Lived Intangible Asset Useful Life Useful Life Fixed charge coverage ratio maximum. Fixed Charge Coverage Ratio Maximum Fixed Charge Coverage Ratio, Maximum Fixed charge coverage ratio minimum. Fixed Charge Coverage Ratio Minimum Fixed Charge Coverage Ratio, Minimum Furniture And Fixtures Gross Office equipment and software Gain Loss On Sale Of Property Plant Equipment Gain on sale of property, plant and equipment Goodwill Balance, Ending Balance, Beginning Goodwill Goodwill And Intangible Assets Disclosure [Text Block] Intangible Assets Including Goodwill Goodwill Gross Goodwill Goodwill Impaired Accumulated Impairment Loss Cumulative impairment loss Goodwill Impairment Loss Impairment charge Goodwill [Line Items] Goodwill [Line Items] Goodwill Translation Adjustments Translation adjustment Gross and net amount of uncompleted contracts. Gross And Net Amount Of Uncompleted Contracts Table [Text Block] Gross and Net Amount of Uncompleted Contracts Gross Profit Gross profit Gross profit Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income before income tax expense Income Tax Disclosure [Text Block] Income Taxes Income Taxes Paid Net Income taxes Income Tax Expense Benefit Provision for federal, state and foreign income taxes Income Tax Policy [Text Block] Income Taxes Increase Decrease In Accounts Payable Accounts payable Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Liabilities Accrued expenses Increase Decrease In Billing In Excess Of Cost Of Earnings Billings on uncompleted contracts in excess of costs and estimated earnings Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Costs and estimated earnings in excess of billings on uncompleted contracts Increase Decrease In Inventories Inventories Increase Decrease In Operating Capital [Abstract] Changes in operating assets and liabilities increasing (decreasing) cash: Increase Decrease In Other Operating Assets Other assets Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends Dilutive nonvested deferred shares Incremental Common Shares Attributable To Share Based Payment Arrangements Dilutive stock options Indefinite Lived Intangible Assets By Major Class [Axis] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite Lived Intangible Assets Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite Lived Trade Names Indefinite Trade Names Industrial. Industrial [Member] Industrial [Member] Intangible assets accumulated amortization excluding goodwill. Intangible Assets Accumulated Amortization Excluding Goodwill Total intangible assets, accumulated amortization Intangible assets gross excluding goodwill. Intangible Assets Gross Excluding Goodwill Total intangible assets, gross carrying amount Intangible Assets Net Excluding Goodwill Other intangible assets Total intangible assets, net carrying amount Intellectual property. Intellectual Property [Member] Intellectual Property [Member] Interest Expense Interest expense Interest Paid Interest Inventory Net Inventories Investment Income Interest Interest income Legal Entity [Axis] Legal Entity [Axis] Letters Of Credit Subject To Credit Facility. Letters Of Credit Subject To Credit Facility Letters of credit subject to the credit facility Liabilities Total liabilities Liabilities And Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity [Abstract] Liabilities and stockholders' equity Liabilities Current Total current liabilities Liabilities Current [Abstract] Current liabilities: Line of credit basis spread on alternate base rate maximum. Line Of Credit Basis Spread On Alternate Base Rate Maximum Additional Margin on alternate base rate loans, Maximum Line of credit basis spread on alternate base rate minimum. Line Of Credit Basis Spread On Alternate Base Rate Minimum Additional Margin on alternate base rate loans, Minimum Line of credit basis spread on Canadian deposit offered rate maximum. Line Of Credit Basis Spread On Canadian Deposit Offered Rate Maximum Additional Margin on CDOR loans, Maximum Line of credit basis spread on Canadian deposit offered rate minimum. Line Of Credit Basis Spread On Canadian Deposit Offered Rate Minimum Additional Margin on CDOR loans, Minimum Line of credit basis spread on Canadian prime rate maximum. Line Of Credit Basis Spread On Canadian Prime Rate Maximum Additional Margin on Canadian prime rate loans, Maximum Line of credit basis spread on Canadian prime rate minimum. Line Of Credit Basis Spread On Canadian Prime Rate Minimum Additional Margin on Canadian prime rate loans, Minimum Line of credit basis spread on London interbank offered rate maximum. Line Of Credit Basis Spread On London Interbank Offered Rate Maximum Additional Margin on LIBOR loans, Maximum Line of credit basis spread on London interbank offered rate minimum. Line Of Credit Basis Spread On London Interbank Offered Rate Minimum Additional Margin on LIBOR loans, Minimum Line Of Credit Facility Amount Outstanding Borrowings outstanding Line of credit facility Canadian deposit offered rate description. Line Of Credit Facility Canadian Deposit Offered Rate Description CDOR Rate description Line of credit facility Canadian prime rate description. Line Of Credit Facility Canadian Prime Rate Description Canadian prime rate description Line Of Credit Facility Maximum Borrowing Capacity Senior credit facility Senior secured revolving credit facility Line of credit facility maximum borrowing capacity after consideration of capacity constraint. Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint Capacity under the credit facility Line Of Credit Facility Remaining Borrowing Capacity Availability under the senior credit facility Line Of Credit Facility Unused Capacity Commitment Fee Percentage Unused Credit Facility Fee Long Term Contracts Or Programs Disclosure [Text Block] Customer Contracts Long Term Debt Noncurrent Long term debt Machinery And Equipment Gross Construction equipment Maximum limit of consolidated funded indebtedness. Maximum Limit Of Consolidated Funded Indebtedness Maximum limit of consolidated funded indebtedness Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Net Cash Provided By Used In Financing Activities Net cash provided (used) by financing activities Net Cash Provided By Used In Financing Activities [Abstract] Financing activities: Net Cash Provided By Used In Investing Activities Net cash used by investing activities Net Cash Provided By Used In Investing Activities [Abstract] Investing activities: Net Cash Provided By Used In Operating Activities Net cash used by operating activities Net Cash Provided By Used In Operating Activities [Abstract] Operating activities: Net Income Loss Net income Net income Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] Oil gas & chemical. Oil Gas And Chemical [Member] Oil Gas & Chemical [Member] Operating Income Loss Operating income Operating income Operating Statistics [Line Items ] Operating Statistics [Line Items] Operating Statistics [Line Items] Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Basis of Presentation Other Assets Current Other current assets Other Assets Noncurrent Other assets Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Foreign currency translation adjustments Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income (loss), net of tax: