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SELECTED QUARTERLY FINANCIAL DATA - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 29, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]                      
Revenue from services $ 591,040 $ 636,793 $ 588,594 $ 552,352 $ 650,147 $ 680,371 $ 614,301 $ 554,388 $ 2,368,779 $ 2,499,207 $ 2,508,771
Cost of services 440,697 467,671 430,277 403,976 477,717 496,053 448,717 411,120 1,742,621 1,833,607 1,874,298
Gross profit 150,343 169,122 158,317 148,376 172,430 184,318 165,584 143,268 626,158 665,600 634,473
Selling, general and administrative expense 133,983 131,187 127,599 129,661 145,280 145,382 134,207 125,763 522,430 550,632 510,794
Depreciation and amortization 9,021 8,749 9,827 9,952 10,272 10,586 10,101 10,090 37,549 41,049 46,115
Income from operations 7,339 29,186 20,891 8,763 16,878 28,350 21,276 7,415 66,179 73,919 77,564
Interest expense (686) (715) (660) (722) (1,279) (1,357) (1,355) (890) (2,783) (4,881) (5,494)
Interest and other income 2,700 1,186 1,487 1,275 2,127 1,017 387 3,094 6,648 6,625 5,480
Interest and other income (expense), net 2,014 471 827 553 848 (340) (968) 2,204 3,865 1,744 (14)
Income before tax expense 9,353 29,657 21,718 9,316 17,726 28,010 20,308 9,619 70,044 75,663 77,550
Income tax expense 638 2,981 2,312 1,040 2,839 3,630 2,576 864 6,971 9,909 22,094
Net income $ 8,715 $ 26,676 $ 19,406 $ 8,276 $ 14,887 $ 24,380 $ 17,732 $ 8,755 $ 63,073 $ 65,754 $ 55,456
Basic (in dollars per share) $ 0.23 $ 0.69 $ 0.50 $ 0.21 $ 0.38 $ 0.61 $ 0.44 $ 0.22 $ 1.63 $ 1.64 $ 1.35
Diluted (in dollars per share) $ 0.23 $ 0.68 $ 0.49 $ 0.21 $ 0.37 $ 0.61 $ 0.44 $ 0.22 $ 1.61 $ 1.63 $ 1.34