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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Selected Quarterly Financial Information [Abstract]                      
Revenue from services $ 650,147 $ 680,371 $ 614,301 $ 554,388 $ 669,625 $ 660,780 $ 610,122 $ 568,244 $ 2,499,207 $ 2,508,771 $ 2,750,640
Cost of services 477,717 496,053 448,717 411,120 501,880 488,761 454,842 428,815 1,833,607 1,874,298 2,070,922
Gross profit 172,430 184,318 165,584 143,268 167,745 172,019 155,280 139,429 665,600 634,473 679,718
Selling, general and administrative expense 145,280 145,382 134,207 125,763 132,644 131,552 124,754 121,844 550,632 510,794 546,477
Depreciation and amortization 10,272 10,586 10,101 10,090 11,465 11,189 12,287 11,174 41,049 46,115 46,692
Income (loss) from operations 16,878 28,350 21,276 7,415 23,636 29,278 18,239 6,411 73,919 77,564 (16,995)
Interest expense (1,279) (1,357) (1,355) (890) (1,601) (1,365) (1,296) (1,232) (4,881) (5,494) (7,166)
Interest and other income 2,127 1,017 387 3,094 1,577 1,146 1,451 1,306 6,625 5,480 3,821
Interest and other income (expense), net 848 (340) (968) 2,204 (24) (219) 155 74 1,744 (14) (3,345)
Income (loss) before tax expense (benefit) 17,726 28,010 20,308 9,619 23,612 29,059 18,394 6,485 75,663 77,550 (20,340)
Income tax expense (benefit) 2,839 3,630 2,576 864 7,185 7,838 5,260 1,811 9,909 22,094 (5,089)
Net income (loss) $ 14,887 $ 24,380 $ 17,732 $ 8,755 $ 16,427 $ 21,221 $ 13,134 $ 4,674 $ 65,754 $ 55,456 $ (15,251)
Basic (in dollars per share) $ 0.38 $ 0.61 $ 0.44 $ 0.22 $ 0.41 $ 0.52 $ 0.32 $ 0.11 $ 1.64 $ 1.35 $ (0.37)
Diluted (in dollars per share) $ 0.37 $ 0.61 $ 0.44 $ 0.22 $ 0.40 $ 0.51 $ 0.31 $ 0.11 $ 1.63 $ 1.34 $ (0.37)