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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Cash flows from operating activities:    
Net income $ 7,478us-gaap_ProfitLoss $ 5,549us-gaap_ProfitLoss
Non-cash items:    
Depreciation and amortization 4,906us-gaap_DepreciationDepletionAndAmortization 4,426us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 2,376us-gaap_ShareBasedCompensation 2,398us-gaap_ShareBasedCompensation
Deferred income taxes 179us-gaap_DeferredIncomeTaxExpenseBenefit 863us-gaap_DeferredIncomeTaxExpenseBenefit
Other non-cash items 66us-gaap_OtherNoncashIncomeExpense (489)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:    
Accounts receivable (13,669)us-gaap_IncreaseDecreaseInAccountsReceivable (6,531)us-gaap_IncreaseDecreaseInAccountsReceivable
Insurance recoverable - environmental remediation (1,516)us-gaap_IncreaseDecreaseInInsuranceSettlementsReceivable (11,339)us-gaap_IncreaseDecreaseInInsuranceSettlementsReceivable
Income taxes 90us-gaap_IncreaseDecreaseInIncomeTaxes (2,441)us-gaap_IncreaseDecreaseInIncomeTaxes
Restricted investments (1,580)us-gaap_IncreaseDecreaseOfRestrictedInvestments 3,048us-gaap_IncreaseDecreaseOfRestrictedInvestments
Prepaid expenses and other current assets (2,052)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (869)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Long-term prepaid insurance 1,355us-gaap_IncreaseDecreaseInPrepaidInsurance 1,536us-gaap_IncreaseDecreaseInPrepaidInsurance
Other assets (14)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 320us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable 3,464us-gaap_IncreaseDecreaseInAccountsPayable (6,257)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation and benefits (3,018)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (3,038)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Deferred revenue (1,342)us-gaap_IncreaseDecreaseInDeferredRevenue 1,613us-gaap_IncreaseDecreaseInDeferredRevenue
Environmental remediation liabilities 2,289us-gaap_PaymentsForEnvironmentalLiabilities (710)us-gaap_PaymentsForEnvironmentalLiabilities
Other accrued liabilities 2,194us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 6,472us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Net cash provided by (used in) operating activities 1,206us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (5,449)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Additions to property and equipment (3,962)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,844)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Withdrawals from restricted investments 739us-gaap_ProceedsFromSaleOfRestrictedInvestments 1,214us-gaap_ProceedsFromSaleOfRestrictedInvestments
Acquisition of businesses, net of cash acquired (11,214)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (2,388)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from sale of fixed assets 30us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 61us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Investments in and advances to unconsolidated affiliates 0us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates 5us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
Net cash used in investing activities (14,407)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,962)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Payments on long-term debt and other (2,722)us-gaap_RepaymentsOfLongTermDebt (5,281)us-gaap_RepaymentsOfLongTermDebt
Payments on capital lease obligations (321)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (299)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from long-term debt and other 5,247us-gaap_ProceedsFromIssuanceOfLongTermDebt 4,904us-gaap_ProceedsFromIssuanceOfLongTermDebt
Net working capital and additional cash payments on acquisitions (2,084)us-gaap_OtherPaymentsToAcquireBusinesses (722)us-gaap_OtherPaymentsToAcquireBusinesses
Shares repurchased to settle tax withholding obligations (1,499)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (2,171)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefit from stock-based awards 251us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3,385us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments on exchange of stock options 10us-gaap_ProceedsFromStockOptionsExercised 5us-gaap_ProceedsFromStockOptionsExercised
Net cash used in financing activities (1,118)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (179)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Decrease in cash and cash equivalents (14,319)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (9,590)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 27,597us-gaap_CashAndCashEquivalentsAtCarryingValue 18,136us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 13,278us-gaap_CashAndCashEquivalentsAtCarryingValue 8,546us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information:    
Non-cash consideration for assets acquired $ 1,952us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 $ 2,226us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1