The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	Dec. 25, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013
Segment Reporting Information [Line Items]
Revenue from services	$ 810,733	$ 683,918	$ 627,714	$ 573,315	$ 691,390	$ 633,365	$ 453,227	$ 396,063	$ 2,695,680	$ 2,174,045	$ 1,668,929
Depreciation and amortization	(10,428)	(10,498)	(10,397)	(10,520)	(9,347)	(9,719)	(5,247)	(5,161)	(41,843)	(29,474)	(20,472)
Income from operations	33,157	33,252	23,710	7,723	31,768	29,562	17,982	2,416	97,842	81,728	59,583
Interest and other income (expense), net	(293)	(366)	(202)	(534)	(269)	(409)	450	344	(1,395)	116	1,354
Income before tax expense	$ 32,864	$ 32,886	$ 23,508	$ 7,189	$ 31,499	$ 29,153	$ 18,432	$ 2,760	96,447	81,844	60,937
Corporate Segment
Segment Reporting Information [Line Items]
Income from operations									(37,505)	(32,940)	(33,175)
Staffing Services
Segment Reporting Information [Line Items]
Revenue from services									2,591,166	2,125,915	1,668,929
Income from operations									164,846	138,205	113,230
Managed Services
Segment Reporting Information [Line Items]
Revenue from services									104,514	48,130	0
Income from operations									$ 12,344	$ 5,937	$ 0