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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Selected Quarterly Financial Information [Abstract]                      
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
Cost of services 625,729 515,051 475,748 443,479 533,152 473,766 333,644 296,504 2,060,007 1,637,066 1,226,626
Gross profit 185,004 168,867 151,966 129,836 158,238 159,599 119,583 99,559 635,673 536,979 442,303
Selling, general and administrative expenses 141,419 125,117 117,859 111,593 117,123 120,318 96,354 91,982 495,988 425,777 362,248
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 (1,180) (933) (881) (1,166) (1,431) (1,140) (322) (263) (4,160) (3,156) (1,248)
Interest and other income 887 567 679 632 1,162 731 772 607 2,765 3,272 2,602
Interest 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
Income tax expense 4,696 12,796 6,235 1,473 4,472 8,243 2,350 1,104 25,200 16,169 16,013
Net income $ 28,168 $ 20,090 $ 17,273 $ 5,716 $ 27,027 $ 20,910 $ 16,082 $ 1,656 $ 71,247 $ 65,675 $ 44,924
Basic (in dollars per share) $ 0.68 $ 0.49 $ 0.42 $ 0.14 $ 0.67 $ 0.51 $ 0.39 $ 0.04 $ 1.73 $ 1.61 $ 1.12
Diluted (in dollars per share) $ 0.67 $ 0.48 $ 0.42 $ 0.14 $ 0.65 $ 0.51 $ 0.39 $ 0.04 $ 1.71 $ 1.59 $ 1.11