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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 01, 2017
Sep. 23, 2016
Jun. 24, 2016
Mar. 25, 2016
Dec. 25, 2015
Sep. 25, 2015
Jun. 26, 2015
Mar. 27, 2015
Jan. 01, 2017
Dec. 25, 2015
Dec. 26, 2014
Selected Quarterly Financial Information [Abstract]                      
Revenue from services $ 734,951 $ 697,097 $ 672,612 $ 645,980 $ 810,733 $ 683,918 $ 627,714 $ 573,315 $ 2,750,640 $ 2,695,680 $ 2,174,045
Cost of services 554,064 518,702 502,688 495,468 625,729 515,051 475,748 443,479 2,070,922 2,060,007 1,637,066
Gross profit 180,887 178,395 169,924 150,512 185,004 168,867 151,966 129,836 679,718 635,673 536,979
Selling, general and administrative expense 145,387 134,679 135,787 130,624 141,419 125,117 117,859 111,593 546,477 495,988 425,777
Depreciation and amortization 12,019 11,690 11,694 11,289 10,428 10,498 10,397 10,520 46,692 41,843 29,474
Goodwill and intangible asset impairment charge 0 4,275 99,269 0         103,544 0 0
Income (loss) from operations 23,481 27,751 (76,826) 8,599 33,157 33,252 23,710 7,723 (16,995) 97,842 81,728
Interest expense (1,736) (1,721) (1,740) (1,969) (1,180) (933) (881) (1,166) (7,166) (4,160) (3,156)
Interest and other income 1,164 854 853 950 887 567 679 632 3,821 2,765 3,272
Interest and other income (expense), net (572) (867) (887) (1,019) (293) (366) (202) (534) (3,345) (1,395) 116
Income (loss) before tax expense 22,909 26,884 (77,713) 7,580 32,864 32,886 23,508 7,189 (20,340) 96,447 81,844
Income tax expense (benefit) 4,822 3,455 (13,978) 612 4,696 12,796 6,235 1,473 (5,089) 25,200 16,169
Net income (loss) $ 18,087 $ 23,429 $ (63,735) $ 6,968 $ 28,168 $ 20,090 $ 17,273 $ 5,716 $ (15,251) $ 71,247 $ 65,675
Basic (in dollars per share) $ 0.43 $ 0.56 $ (1.53) $ 0.17 $ 0.68 $ 0.49 $ 0.42 $ 0.14 $ (0.37) $ 1.73 $ 1.61
Diluted (in dollars per share) $ 0.43 $ 0.56 $ (1.53) $ 0.17 $ 0.67 $ 0.48 $ 0.42 $ 0.14 $ (0.37) $ 1.71 $ 1.59