Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Parent [Member] Parent [Member] Treasury Stock [Member] Treasury Stock [Member] Common Stock [Member] Common Stock [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares, Issued Shares, Issued Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Net of Tax Issuance of common stock in connection with business acquired Stock Issued During Period, Value, Acquisitions Issuance of common stock in connection with business acquired (in shares) Stock Issued During Period, Shares, Acquisitions Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Stock-based compensation (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Shares Paid for Tax Withholding for Share Based Compensation Shares Paid for Tax Withholding for Share Based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Adjustments Related to Tax Withholding for Share-based Compensation Deferred Compensation Arrangement with Individual, Shares Issued Deferred Compensation Arrangement with Individual, Shares Issued Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued Excess tax benefit from stock-based awards Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Shares, Issued Ending Balance Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments Schedule of Nonvested Performance-based Units Activity [Table Text Block] Variable Interest Entity [Abstract] Variable Interest Entity [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] CAH Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted investments Restricted Investments, Current Total current assets Assets, Current Other assets Other Assets, Noncurrent Total assets Assets Current liabilities: Liabilities, Current [Abstract] Current portion of long-term debt Long-term Debt, Current Maturities Environmental remediation liabilities Accrued Environmental Loss Contingencies, Current Other accrued liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Long-term debt, net of current portion Long-term Debt, Excluding Current Maturities Long-term environmental remediation liabilities Accrued Environmental Loss Contingencies, Noncurrent Total liabilities Liabilities Variable Interest Entity, Financial or Other Support, Amount Variable Interest Entity, Financial or Other Support, Amount Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accounts Payable and Accrued Liabilities, Current [Abstract] Contract costs and loss accruals Contract Costs and Loss Accruals Contract costs and cumulative provision for contract losses not offset against related costs accumulated on the balance sheet. Legal cases and costs accruals Accrued Professional Fees, Current Lease obligations Deferred Rent Credit Other Accrued Liabilities, Current Accrued Liabilities, Current Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Statement of Other Comprehensive Income [Abstract] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on available-for-sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Adjustments for gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax Total other comprehensive income (loss) Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to TRC Companies, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Billed Billed Revenues [Member] Unbilled Unbilled Revenues [Member] Retainage Retainage Revenues [Member] Retainage represents amounts billed but not paid by the client which, pursuant to contract terms, are due at completion. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Receivable, Net, Current [Abstract] Accounts Receivable, Net, Current [Abstract] Accounts Receivable, Gross, Current Accounts Receivable, Gross, Current Less allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Accounts Receivable, Net, Current Accounts Receivable, Net, Current Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Energy Operating Segment Energy Operating Segment [Member] TRC's Energy operating segment provides services to a range of clients including energy companies, utilities, other commercial entities, and state and federal government entities. TRC's Energy operating segment's services include program management, engineer/procure/construct projects, design, and consulting. TRC's Energy operating segment's typical projects involve upgrades and new construction for electric transmission and distribution systems, energy efficiency program design and management, renewable energy development, power generation and gas transmission. Environmental Operating Segment Environmental Operating Segment [Member] TRC's Environmental operating segment provides services to a wide range of clients, including industrial, transportation, energy and natural resource companies, as well as federal, state and municipal agencies. TRC's Environmental operating segment is organized to focus on key areas of demand including: environmental management of buildings; air quality measurements and modeling of potential air pollution impacts; assessment and remediation of contaminated sites and buildings; solid waste management; environmental, safety and health management and sustainability advisory services including compliance auditing and strategic due diligence; environmental licensing and permitting of a wide variety of projects; and natural and cultural resource assessment, protection and management. Infrastructure Operating Segment Infrastructure Operating Segment [Member] TRC's Infrastructure operating segment provides services related to the expansion of infrastructure capacity, the rehabilitation of overburdened and deteriorating infrastructure systems, and the management of risks related to security of public and private facilities. TRC's Infrastructure operating segment's client base is predominantly state and municipal governments, internal clients from TRC's Energy and Environmental operating segments, as well as selected commercial developers. Primary services include: roadway, bridge and related surface transportation design; structural design and inspection of bridges; program management; construction engineering inspection and construction management for roads and bridges; civil engineering for municipalities and public works departments; geotechnical engineering services; and security assessments, design and construction management. Major markets include the northeast United States, Texas, Louisiana and California. Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, Gross Goodwill, Gross Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Goodwill Goodwill Goodwill, Period Increase (Decrease) Goodwill, Period Increase (Decrease) Goodwill, Gross Goodwill, Impaired, Accumulated Impairment Loss Goodwill Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Types of Awards Available for Grant Share Based Compensation Arrangement By Share Based Payment Award, Number Of Awards Types The number of the types of awards under the 2007 Plan that may be granted including restricted stock awards and restricted stock units, stock options (including both incentive stock options, within the meaning of Section 422 of the Internal Revenue Code and non-qualified options), phantom stock, stock bonus awards, other awards (including stock appreciation rights) and performance based awards. Awards CEO Has Authority To Grant Share Based Compensation Arrangement By Share Based Payment Award, Number Of Shares Authorized Per Employee The maximum number of shares that the CEO is authorized to grant per employee. Number Of Awards That Can Be Granted Annually Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee Period Of Time That Awards Can Be Granted Share Based Compensation Arrangement By Share Based Payment Award, Time Period Of Grant Award Limitations The period of time that limits the maximum number of shares that the CEO is authorized to grant. Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Finite and Indefinite-Lived Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Expected Amortization Expense Schedule of Expected Amortization Expense [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Variable Interest Entity, Primary Beneficiary Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Furniture And Equipment Furniture And Equipment [Member] Furniture And Equipment [Member] Assets Held under Capital Leases Assets Held under Capital Leases [Member] Minimum Minimum [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit [Member] Line of Credit [Member] Revolving Credit Facility Revolving Credit Facility [Member] Subordinated Debt Subordinated Debt [Member] Capital Lease Obligations Capital Lease Obligations [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] CAH note payable CenterAvenueHoldings [Member] In fiscal year 2007, TRC formed a limited liability company, Center Avenue Holdings, LLC ("CAH"), to purchase and remediate certain property in New Jersey. TRC maintains a 70% ownership position in CAH. CAH entered into a term loan agreement with a commercial bank in the amount of approximately $3.2 million which bore interest at a fixed rate of 10.0% annually. The loan is secured by the CAH property and is non-recourse to the members of CAH. The proceeds from the loan were used to purchase, and are currently funding the remediation of, the property. TRC has entered into several modifications of the credit agreement further extending the maturity date of the loan, the latest being in November 2011, which extended the maturity date until October 1, 2013. Alexander Utility Engineering AlexanderUtilityEngineeringMember [Member] Alexander Utility Engineering acquisiiton. Other note payable Notes Payable, Other Payables [Member] Credit Agreement Interest Option [Axis] Credit Agreement Interest Option [Axis] Any amounts outstanding under the Credit Agreement with Wells Fargo Capital Finance bear interest at the prime rate plus a margin of 2.00% to 2.75%, or at LIBOR plus a margin of 3.00% to 3.50%, based on Trailing Twelve Month Earnings Before Interest, Taxes, Depreciation and Amortization (“EBITDA”), as defined. Credit Agreement Interest Option [Domain] Credit Agreement Interest Option [Domain] Any amounts outstanding under the Credit Agreement with Wells Fargo Capital Finance bear interest at the prime rate plus a margin of 2.00% to 2.75%, or at LIBOR plus a margin of 3.00% to 3.50%, based on Trailing Twelve Month Earnings Before Interest, Taxes, Depreciation and Amortization (“EBITDA”), as defined. Prime Rate Prime Rate [Member] Any amounts outstanding under the Credit Agreement with Wells Fargo Capital Finance bear interest at the prime rate plus a margin of 2.00% to 2.75%, or at LIBOR plus a margin of 3.00% to 3.50%, based on Trailing Twelve Month Earnings Before Interest, Taxes, Depreciation and Amortization (“EBITDA”), as defined. LIBOR LIBOR [Member] Any amounts outstanding under the Credit Agreement with Wells Fargo Capital Finance bear interest at the prime rate plus a margin of 2.00% to 2.75%, or at LIBOR plus a margin of 3.00% to 3.50%, based on Trailing Twelve Month Earnings Before Interest, Taxes, Depreciation and Amortization (“EBITDA”), as defined. Debt Instrument [Line Items] Debt Instrument [Line Items] Line of Credit Facility [Abstract] Line of Credit Facility [Abstract] Senior Revolving Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line Of Credit Facility, Amount Of Syndication Reserve Line Of Credit Facility, Amount Of Syndication Reserve Reserve Established And Maintained By Agent Prior To The Occurance Of A Sucessful Syndication. Such A Reserve Would Be Automatically Released Upon (And Only Upon) The Occurance Of A Successful Syndication Margin Percentage Related To Interest On Revolving Credit Facility Debt Instrument, Basis Spread on Variable Rate Average Monthly Backlog Maintained Line Of Credit Facility, Average Monthly Backlog Retained Covenant Line Of Credit Facility, Average Monthly Backlog Maintained Covenant of $190.0 million measured on a quarterly basis. Fixed Charge Coverage Ratio Line Of Credit Facility, Fixed Charge Coverage Ratio Covenant Line Of Credit Facility, Fixed Charge Coverage Ratio Covenant is a minimum ratio of 1.00 to 1.00. A fixed charge coverage ratio covenant is applicable only if available borrowing capacity under the facility plus qualified cash, measured on a trailing 30 days average basis, is less than $20,000, or at any point during the most recent fiscal quarter, is less than $15,000. Days Used To Measure Average Fixed Charge Coverage Ratio Line Of Credit Facility, Days Used To Measure Average Fixed Charge Coverage Ratio Line Of Credit Facility, Days Used To Measure Average Fixed Charge Coverage Ratio is measured using a trailing 30 days average basis. Balance Of Borrowing Capacity Plus Qualified Cash That Must Be Maintained Before Fixed Charge Coverage Ratio Covenant Is Applicable, Measured On 30 Average Basis Line Of Credit Facility, Balance Of Borrowing Capacity Plus Qualified Cash That Must Be Maintained Before Fixed Charge Coverage Ratio Covenant Is Applicable, Measured On 30 Average Basis A fixed charge coverage ratio covenant is applicable if available borrowing capacity under the facility plus qualified cash, measured on a trailing 30 days average basis, is less than $20.0 million. Balance Of Borrowing Capacity Plus Qualified Cash That Must Be Maintained Before Fixed Charge Coverage Ratio Covenant Is Applicable During Last Fiscal Quarter Line Of Credit Facility, Balance Of Borrowing Capacity Plus Qualified Cash That Must Be Maintained Before Fixed Charge Coverage Ratio Covenant Is Applicable During Last Fiscal Quarter A fixed charge coverage ratio covenant is applicable if available borrowing capacity under the facility plus qualified cash if at any point during the most recent fiscal quarter, is less than $15.0 million. Earnings Before Interest, Taxes, Deprecation and Amortization Measured Quarterly Fair Value Inputs, Earnings Before Interest, Taxes, Deprecation and Amortization Measured Quarterly “EBITDA” means, with respect to any fiscal period, Parent’s and its Subsidiaries’ consolidated net earnings (or loss), minus (a) without duplication and to the extent included in determining Parent’s and its Subsidiaries’ consolidated net earnings (or loss) for such period, the sum for such period of (i) extraordinary gains and (ii) interest income (excluding interest income related to any Exit Strategy Program), in the case of each of clauses (a)(i) and (a)(ii) above determined on a consolidated basis in accordance with GAAP, plus (b) without duplication and to the extent deducted in determining Parent’s and its Subsidiaries’ consolidated net earnings (or loss) for such period, the sum for such period of (i) interest expenses, (ii) income taxes, (iii) depreciation and amortization, (iv) restructuring charges incurred during the fiscal year ended June 30, 2008 in an aggregate amount not to exceed $2,750,000, (v) restructuring charges incurred during the fiscal year ended June 30, 2009 in an aggregate amount not to exceed $1,500,000 (provided that no amount under this clause (v) shall be added back for purposes of calculating EBITDA unless and until Agent has received satisfactory documentation and other evidence relating to any such restructuring charges), (vi) restructuring charges incurred during the fiscal year ended June 30, 2010 in an aggregate amount not to exceed $3,000,000 (provided that no amount under this clause (vi) shall be added back for purposes of calculating EBITDA unless and until Agent has received satisfactory documentation and other evidence relating to any such restructuring charges), (vii) restructuring charges incurred during the fiscal year ended June 30, 2011 in an aggregate amount not to exceed $1,250,000 (provided that no amount under this clause (vii) shall be added back for purposes of calculating EBITDA unless and until Agent has received satisfactory documentation and other evidence relating to any such restructuring charges), (viii) charges incurred during the fiscal year ended June 30, 2011 in an aggregate amount not to exceed $19,500,000 relating to legal costs and reserves as previously discussed with Agent (provided that no amount under this clause (viii) shall be added back for purposes of calculating EBITDA unless and until Agent has received satisfactory documentation and other evidence relating to any such charges), (ix) non-cash losses incurred in connection with the Exit Strategy Program solely to the extent such losses are reimbursable to Parent or one of its Subsidiaries under insurance policies with AIG (or another insurer), and (x) non-cash goodwill impairment charges and non-cash dividend and preferred stock accretion charges, in the case of each of clauses (b)(i) through and including (b)(x) above, determined on a consolidated basis in accordance with GAAP.” Annual Capital Expenditures, Current Year Annual Capital Expenditures, Current Year Annual capital expenditures in the current fiscal year is limited to $7.5 million. Letters of Credit, Amount Available For Issue Letters of Credit, Amount Available For Issue The amount of letters of credit available for issue under the Credit Agreement. Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Subordinated Long-term Debt, Noncurrent Subordinated Long-term Debt, Noncurrent Long-term Debt Long-term Debt Capital Lease Obligations Capital Lease Obligations Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Interest Ownership Percentage by Parent Variable Interest Entity Interest Ownership Percentage By Parent The percentage of ownership of common stock or equity participation in the investee accounted for as a variable interest entity. Number Of Installment Payments Number Of Installment Payments The number of installment payments to be made on a note payable. Debt Instrument, Annual Principal Payment Debt Instrument, Annual Principal Payment Debt Instrument, Face Amount Debt Instrument, Face Amount Length Of Note Payable Length Of Note Payable The term in years of a note payable. Debt Instrument, Frequency of Periodic Payment Debt Instrument, Frequency of Periodic Payment Debt Instrument, Periodic Payment Debt Instrument, Periodic Payment Stated Finance Charge Rate Stated Finance Charge Rate The percent of the finance charge rate applied to the note paybale amount outstanding. Accumulated amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Stockholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Stock Options Stock Options [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Stock Plan, 2007 Stock Plan, 2007 [Member] The 2007 Plan is a stock-based award plan of TRC that was originally approved by the Company's shareholders in May 2007 and amended and restated as of July 20, 2009. TRC may generally grant six types of awards under the 2007 Plan: restricted stock awards and restricted stock units, stock options (including both incentive stock options, within the meaning of Section 422 of the Internal Revenue Code and non-qualified options), phantom stock, stock bonus awards, other awards (including stock appreciation rights) and performance based awards. Share Price Share Price Total Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Cash Received from Exercise of Stock Options Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Tax Benefit Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options Stock Issued During Period, Shares, Acquisitions Unrecognized compensation expense related to unvested stock option grants Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options Compensation Expense, Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Weighted Average Period Expected To Vest Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Weighted Average Period Expected To Vest Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Weighted Average Period Expected To Vest Income Statement [Abstract] Gross revenue Sales Revenue, Services, Other Less subcontractor costs and other direct reimbursable charges Cost of Reimbursable Expense Net service revenue Sales Revenue, Services, Net Interest income from contractual arrangements Interest Income from Contractual Arrangements Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Insurance recoverables and other income Insurance Recoveries Operating costs and expenses: Operating Costs and Expenses [Abstract] Cost of services (exclusive of costs shown seperately below) Cost of Services General and administrative expenses General and Administrative Expense Provision for doubtful accounts Provision for Doubtful Accounts Depreciation and amortization Depreciation, Depletion and Amortization Arena Towers litigation reversal Gain (Loss) Related to Litigation Settlement Total operating costs and expenses Costs and Expenses Operating income Operating Income (Loss) Interest expense Interest Expense Income from operations before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Federal and state income tax benefit (provision) Income Tax Expense (Benefit) Income (loss) from operations before equity in earnings (losses) Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest Equity in earnings (losses) from unconsolidated affiliates, net of taxes Income (Loss) from Equity Method Investments Net income Net loss applicable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income applicable to TRC Companies, Inc. Net Income (Loss) Attributable to Parent Accretion charges on preferred stock Preferred Stock, Accretion of Redemption Discount Net income (loss) applicable to TRC Companies, Inc.'s common shareholders Net Income (Loss) Available to Common Stockholders, Basic Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Weighted-average common shares outstanding: Weighted-average common shares outstanding: [Abstract] Weighted-average common shares outstanding: [Abstract] Basic (shares) Weighted Average Number of Shares Outstanding, Basic Diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Risk free interest rate, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk free interest rate, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volalitity, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Weighted-average fair value of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding Options At Beginning Of Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised (in shares) Options Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding Options At End Of Period Options Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options Vested And Expected To Vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options Available For Future Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Outstanding Options At Beginning Of Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options Granted, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options Exercised, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options Forfeited, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options Expired, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Outstanding Options At End Of Period, Weighted Average Exercise Price Options Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options Vested And Expected To Vest, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Outstanding Options, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding Options, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Options Exercisable, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options Vested And Expected To Vest, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options Vested And Expected To Vest, Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Current portion of accounts receivable and schedule of allowance for doubtful accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Total [Member] Operating Segments [Member] Energy Environmental Infrastructure Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Sales Revenue, Services, Other Number of operating segments (in segments) Number of Operating Segments Net service revenue Segment profit Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Non-cash items: Other Noncash Income (Expense) [Abstract] Stock-based compensation expense Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Other non-cash items Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Insurance recoverable - environmental remediation Increase (Decrease) in Insurance Settlements Receivable Income taxes Increase (Decrease) in Income Taxes Restricted investments Increase (Decrease) of Restricted Investments Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Long-term prepaid insurance Increase (Decrease) in Long-Term Prepaid Insurance The increase (decrease) during the reporting period in the value of long-term prepaid insurance. Other assets Increase (Decrease) in Other Noncurrent Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Environmental remediation liabilities Payments for Environmental Liabilities Other accrued liabilities Increase (Decrease) in Other Accrued Liabilities Excess tax benefit from stock-based awards Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Restricted investments Payments to Acquire Restricted Investments Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Earnout and net working capital payments on acquisitions Other Payments to Acquire Businesses Proceeds from sale of land Proceeds from Sale of Land Held-for-use Proceeds from sale of fixed assets Proceeds from Sale of Property, Plant, and Equipment Investments in and advances to unconsolidated affiliates Payments to Acquire Interest in Subsidiaries and Affiliates Purchases of marketable securities Payments to Acquire Marketable Securities Maturities and sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net repayments under revolving credit facility Repayments of Lines of Credit Payments on long-term debt and other Repayments of Long-term Debt Payments on capital lease obligations Repayments of Long-term Capital Lease Obligations Proceeds from long-term debt and other Proceeds from Issuance of Long-term Debt Shares repurchased to settle tax withholding obligations Payments Related to Tax Withholding for Share-based Compensation Excess tax benefit from stock-based awards Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Proceeds from exercise of stock options Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Payments on exchange of stock options Proceeds from (Payments for) Other Financing Activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations (Decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Assets acquired through capital lease obligations Capital Lease Obligations Incurred Future consideration in connection with businesses acquired Other Significant Noncash Transaction, Value of Consideration Given Issuance of common stock in connection with businesses acquired Stock Issued Subordinated note payable recorded in connection with business acquired Notes Issued Operating Segments Segment Reporting Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Organization, Consolidation and Presentation of Financial Statements [Abstract] Company Background and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Income Tax Disclosure [Abstract] Federal and State Income Taxes Income Tax Disclosure [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements Significant Accounting Policies [Text Block] Operating Segments Reconciling Items Significant Reconciling Items [Member] Unallocated Unallocated Amount to Segment [Member] Gross revenue Revenues Operating income (loss) Corporate shared services(2) Corporate Shared Services Corporate shared services consists of centrally managed functions in the following areas: accounting, treasury, information technology, legal, human resources, marketing, internal audit and executive management such as the CEO and various executives. These costs and other items of a general corporate nature are not allocated to the Company's three operating segments. Arena Towers litigation expense (reversal) Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Goodwill and intangible asset impairment Goodwill and Intangible Asset Impairment Depreciation and amortization Gain on extinguishment of debt Gains (Losses) on Extinguishment of Debt Schedule of Identifiable Intangible Assets [Table] Schedule of Identifiable Intangible Assets [Table] Schedule of Identifiable Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships Customer Relationships [Member] Contract Backlog Order or Production Backlog [Member] 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] Engineering Licenses Licensing Agreements [Member] Indentifiable Intangible Assets [Line Items] Indentifiable Intangible Assets [Line Items] Indentifiable Intangible Assets [Line Items] Goodwill Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Finite-lived Intangible Assets Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Accumulated Amortization of Identifiable Intangible Assets Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Indefinite-lived Intangible Assets Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill) Intangible Assets (Excluding Goodwill), Gross Intangible Assets (Excluding Goodwill), Gross Intangible Assets Net Excluding Goodwill Accumulated Amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Accumulated Amortization Accumulated amount of amortization of all intangible assets, excluding goodwill, as of the balance sheet date. Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Amortization of Intangible Assets Amortization of Intangible Assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2013 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Environmental Restoration Costs Environmental Restoration Costs [Member] Performance Guarantee [Member] Performance Guarantee [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of environmental remediation projects near term or limits of insurance Number of Environmental Remediation Projects Near Term or Limits of Insurance Number of Environmental Remediation Projects Near Term or Limits of Insurance Loss contingency beyond the limits or term of insurance, minimum Loss Contingency, Range of Possible Loss, Minimum Loss contingency beyond the limits or term of insurance, maximum Loss Contingency, Range of Possible Loss, Maximum Accrued litigation-related liabilities Loss Contingency Accrual, at Carrying Value Insurance recovery receivables related to litigation related reserves Loss Contingency, Related Receivable Carrying Value Possible increase in potential litigation related liabilities Loss Contingency Accrual, Carrying Value, Potential Increase Loss Contingency Accrual, Carrying Value, Potential Increase Amount of potential litigation related liabilities covered by insurance Loss Contingency, Litigation Settlement, Amount Covered By Insurance Loss Contingency, Litigation Settlement, Amount Covered By Insurance Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Performance Stock Unit [Axis] Performance Stock Unit [Axis] Performance Stock Unit [Axis] Performance Stock Unit [Domain] Performance Stock Unit [Domain] [Domain] for Performance Stock Unit [Axis] Original [Member] Original [Member] Original [Member] Adjustments [Member] Adjustments [Member] Adjustments [Member] Vesting Period Type [Axis] Vesting Period Type [Axis] Vesting Period Type [Axis] Vesting Period Type [Domain] Vesting Period Type [Domain] Vesting Period Type [Domain] Time Based [Member] Time Based [Member] Time Based [Member] Performance Based [Member] Performance Based [Member] Performance Based [Member] Restricted Stock Awards (RSAs) Restricted Stock [Member] Performance Stock Units (PSUs) Performance Shares [Member] 2013 Award [Member] 2013 Award [Member] 2013 Award [Member] 2012 Award [Member] 2012 Award [Member] 2012 Award [Member] Employment Agreement Employement Agreement [Member] The Third Amended and Restated Employment Agreement with Christopher P. Vincze effective July 1, 2011. Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Non-vested awards, beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Awards granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Awards forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-vested awards, end of period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Non-vested awards, Weighted Average Grate Date Fair Value, Beginning Of Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Awards granted, Weighted Average Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Awards vested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Awards forfeited, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Non-vested awards, Weighted Average Grate Date Fair Value, End Of Period Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Fair Value At Grant Date The weighted-average grant date fair value amount of equity instrumnets other than options. Total Fair Value Of Units Vesting During Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Allocated Share-based Compensation Expense Total Unrecognized Compensation Expense Related To Unvested Units Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Percentage Of Payout Earned Based On Predefined Targets Percentage Of Payout Earned Based On Predefined Targets Percentage Of Payout Earned Based On Predefined Targets Unrecognized Compensation Expense, Weighted Average Period Expected To Vest Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Units That Will Be Awarded In One Year Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Awarded In Period Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Awarded In Period Share Based Compensation Arrangement By Share Based Payment Award, Award Vesting Restrictions, Common Stock Percentage Share Based Compensation Arrangement By Share Based Payment Award, Award Vesting Restrictions, Common Stock Percentage The percentage of common stock subject to vesting restrictions. Share Based Compensation Arrangement By Share Based Payment Award, Vesting Installment Period Share Based Compensation Arrangement By Share Based Payment Award, Vesting Installment Period Share Based Compensation Arrangement By Share Based Payment Award, Vesting Installment Period Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Federal and State Income Tax (Provision) Benefit [Table] Federal and State Income Tax (Provision) Benefit [Table] The current and deferred federal and state income tax benefit (provision) table. Nature Of Tax Expense [Axis] Nature Of Tax Effect [Axis] Nature Of Tax Effect [Axis] Nature Of Tax Benefit [Domain] Nature Of Tax Benefit [Domain] [Domain] for Nature Of Tax Benefit [Axis] Remeasurement Of Uncertain Tax Positions [Member] Remeasurement Of Uncertain Tax Positions [Member] Remeasurement Of Uncertain Tax Positions [Member] Valuation Allowance, Due To Acquisition [Member] Valuation Allowance, Due To Acquisition [Member] Valuation Allowance, Due To Acquisition [Member] Federal and State Income Tax (Provision) Benefit [Line Items] Federal and State Income Tax (Provision) Benefit [Line Items] Federal and State Income Tax (Provision) Benefit [Line Items] Total (provision) benefit Tax Benefit Federal Income Tax Expense (Benefit), Continuing Operations State tax expense State and Local Income Tax Expense (Benefit), Continuing Operations Recorded liability for uncertain tax positions Liability for Uncertain Tax Positions, Noncurrent Other Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Investment [Axis] Investment [Axis] Investment [Domain] Investment [Domain] Mutual Funds Equity Funds [Member] Certificates of deposit Certificates of Deposit [Member] Municipal Bonds Municipal Bonds [Member] Corporate bonds Corporate Debt Securities [Member] Assets Backed Securities [Member] Assets Backed Securities [Member] Assets Backed Securities [Member] Money market accounts Money Market Funds [Member] Mutual Funds, Bonds, Certificates Of Deposits And US Treasury Notes Mutual Funds, Bonds, Certificates Of Deposits And US Treasury Notes [Member] Mutual Funds, Bonds, Certificates Of Deposits And US Treasury Notes [Member] Contingent Consideration Contingent Consideration [Member] Probable future sacrifices of economic benefits arising from present contingent consideration obligations of an entity to transfer assets or provide services to other entities in the future. Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Total Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Restricted Investments, at Fair Value Restricted Investments, at Fair Value Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Net Income (Loss) Attributable to Parent Effect of dilutive stock options and restricted stock Incremental Common Shares Attributable to Share-based Payment Arrangements Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share, Diluted Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Variable Interest Entity Variable Interest Entity Disclosure [Text Block] Disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Cost of Sales Cost of Sales [Member] General and Administrative Expenses General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] ASSETS Assets [Abstract] Accounts receivable, less allowance for doubtful accounts Insurance recoverable - environmental remediation Insurance Settlements Receivable, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Income taxes refundable Income Taxes Receivable, Current Total current assets Property and equipment Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Property and equipment, net Property, Plant and Equipment, Net Investments in and advances to unconsolidated affiliates and construction joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Long-term restricted investments Restricted Investments, Noncurrent Long-term prepaid insurance Prepaid Expense, Noncurrent Total assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Current portion of capital lease obligations Capital Lease Obligations, Current Accounts payable Accounts Payable, Current Accrued compensation and benefits Employee-related Liabilities, Current Deferred revenue Deferred Revenue, Current Other accrued liabilities Non-current liabilities: Liabilities, Noncurrent [Abstract] Capital lease obligations, net of current portion Capital Lease Obligations, Noncurrent Income taxes payable and deferred income tax liabilities Accrued Income Taxes, Noncurrent Deferred revenue Deferred Revenue, Noncurrent Environmental remediation liabilities Commitments and contingencies Commitments and Contingencies Equity: Equity [Abstract] Common stock, $.10 par value; 40,000,000 shares authorized, 28,727,905 and 28,724,423 shares issued and outstanding, respectively, at September 30, 2012, and 28,130,702 and 28,127,220 shares issued and outstanding, respectively, at June 30, 2012 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost Treasury Stock, Value Total shareholders' equity applicable to TRC Companies, Inc. Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total equity Total liabilities and equity Liabilities and Equity Long-Term Debt Long-term Debt [Text Block]