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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Selected Quarterly Financial Information [Abstract]
Revenue from services	$ 691,390us-gaap_SalesRevenueServicesNet	$ 633,365us-gaap_SalesRevenueServicesNet	$ 453,227us-gaap_SalesRevenueServicesNet	$ 396,063us-gaap_SalesRevenueServicesNet	$ 448,952us-gaap_SalesRevenueServicesNet	$ 451,169us-gaap_SalesRevenueServicesNet	$ 422,310us-gaap_SalesRevenueServicesNet	$ 346,498us-gaap_SalesRevenueServicesNet	$ 2,174,045us-gaap_SalesRevenueServicesNet	$ 1,668,929us-gaap_SalesRevenueServicesNet	$ 1,389,530us-gaap_SalesRevenueServicesNet
Cost of services	533,152us-gaap_CostOfServices	473,766us-gaap_CostOfServices	333,644us-gaap_CostOfServices	296,504us-gaap_CostOfServices	328,689us-gaap_CostOfServices	327,641us-gaap_CostOfServices	310,437us-gaap_CostOfServices	259,859us-gaap_CostOfServices	1,637,066us-gaap_CostOfServices	1,226,626us-gaap_CostOfServices	1,017,145us-gaap_CostOfServices
Gross profit	158,238us-gaap_GrossProfit	159,599us-gaap_GrossProfit	119,583us-gaap_GrossProfit	99,559us-gaap_GrossProfit	120,263us-gaap_GrossProfit	123,528us-gaap_GrossProfit	111,873us-gaap_GrossProfit	86,639us-gaap_GrossProfit	536,979us-gaap_GrossProfit	442,303us-gaap_GrossProfit	372,385us-gaap_GrossProfit
Selling, general and administrative expenses	117,123us-gaap_SellingGeneralAndAdministrativeExpense	120,318us-gaap_SellingGeneralAndAdministrativeExpense	96,354us-gaap_SellingGeneralAndAdministrativeExpense	91,982us-gaap_SellingGeneralAndAdministrativeExpense	93,710us-gaap_SellingGeneralAndAdministrativeExpense	90,767us-gaap_SellingGeneralAndAdministrativeExpense	89,339us-gaap_SellingGeneralAndAdministrativeExpense	88,432us-gaap_SellingGeneralAndAdministrativeExpense	425,777us-gaap_SellingGeneralAndAdministrativeExpense	362,248us-gaap_SellingGeneralAndAdministrativeExpense	300,459us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization	9,347us-gaap_DepreciationAndAmortization	9,719us-gaap_DepreciationAndAmortization	5,247us-gaap_DepreciationAndAmortization	5,161us-gaap_DepreciationAndAmortization	5,339us-gaap_DepreciationAndAmortization	4,771us-gaap_DepreciationAndAmortization	5,203us-gaap_DepreciationAndAmortization	5,159us-gaap_DepreciationAndAmortization	29,474us-gaap_DepreciationAndAmortization	20,472us-gaap_DepreciationAndAmortization	18,890us-gaap_DepreciationAndAmortization
Income from operations	31,768us-gaap_OperatingIncomeLoss	29,562us-gaap_OperatingIncomeLoss	17,982us-gaap_OperatingIncomeLoss	2,416us-gaap_OperatingIncomeLoss	21,214us-gaap_OperatingIncomeLoss	27,990us-gaap_OperatingIncomeLoss	17,331us-gaap_OperatingIncomeLoss	(6,952)us-gaap_OperatingIncomeLoss	81,728us-gaap_OperatingIncomeLoss	59,583us-gaap_OperatingIncomeLoss	53,036us-gaap_OperatingIncomeLoss
Interest expense	(1,431)us-gaap_InterestExpense	(1,140)us-gaap_InterestExpense	(322)us-gaap_InterestExpense	(263)us-gaap_InterestExpense	(329)us-gaap_InterestExpense	(350)us-gaap_InterestExpense	(336)us-gaap_InterestExpense	(233)us-gaap_InterestExpense	(3,156)us-gaap_InterestExpense	(1,248)us-gaap_InterestExpense	(1,131)us-gaap_InterestExpense
Interest and other income	1,162us-gaap_InterestAndOtherIncome	731us-gaap_InterestAndOtherIncome	772us-gaap_InterestAndOtherIncome	607us-gaap_InterestAndOtherIncome	515us-gaap_InterestAndOtherIncome	766us-gaap_InterestAndOtherIncome	611us-gaap_InterestAndOtherIncome	710us-gaap_InterestAndOtherIncome	3,272us-gaap_InterestAndOtherIncome	2,602us-gaap_InterestAndOtherIncome	2,700us-gaap_InterestAndOtherIncome
Interest and other income, net	(269)us-gaap_NonoperatingIncomeExpense	(409)us-gaap_NonoperatingIncomeExpense	450us-gaap_NonoperatingIncomeExpense	344us-gaap_NonoperatingIncomeExpense	186us-gaap_NonoperatingIncomeExpense	416us-gaap_NonoperatingIncomeExpense	275us-gaap_NonoperatingIncomeExpense	477us-gaap_NonoperatingIncomeExpense	116us-gaap_NonoperatingIncomeExpense	1,354us-gaap_NonoperatingIncomeExpense	1,569us-gaap_NonoperatingIncomeExpense
Income before tax expense	31,499us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	29,153us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	18,432us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,760us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21,400us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	28,406us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17,606us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(6,475)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	81,844us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	60,937us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	54,605us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	4,472us-gaap_IncomeTaxExpenseBenefit	8,243us-gaap_IncomeTaxExpenseBenefit	2,350us-gaap_IncomeTaxExpenseBenefit	1,104us-gaap_IncomeTaxExpenseBenefit	6,889us-gaap_IncomeTaxExpenseBenefit	9,454us-gaap_IncomeTaxExpenseBenefit	5,069us-gaap_IncomeTaxExpenseBenefit	(5,399)us-gaap_IncomeTaxExpenseBenefit	16,169us-gaap_IncomeTaxExpenseBenefit	16,013us-gaap_IncomeTaxExpenseBenefit	20,976us-gaap_IncomeTaxExpenseBenefit
Net income	$ 27,027us-gaap_NetIncomeLoss	$ 20,910us-gaap_NetIncomeLoss	$ 16,082us-gaap_NetIncomeLoss	$ 1,656us-gaap_NetIncomeLoss	$ 14,511us-gaap_NetIncomeLoss	$ 18,952us-gaap_NetIncomeLoss	$ 12,537us-gaap_NetIncomeLoss	$ (1,076)us-gaap_NetIncomeLoss	$ 65,675us-gaap_NetIncomeLoss	$ 44,924us-gaap_NetIncomeLoss	$ 33,629us-gaap_NetIncomeLoss
Net income per common share:
Basic (in dollars per share)	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 1.61us-gaap_EarningsPerShareBasic	$ 1.12us-gaap_EarningsPerShareBasic	$ 0.85us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 1.59us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted

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Total costs related to services rendered by an entity during the reporting period.

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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

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