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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 27, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Selected Quarterly Financial Information [Abstract]                      
Revenue from services $ 448,952 $ 451,169 $ 422,310 $ 346,498 $ 344,615 $ 379,467 $ 354,261 $ 311,187 $ 1,668,929 $ 1,389,530 $ 1,316,013
Cost of services 328,689 327,641 310,437 259,859 250,231 274,237 260,725 231,952 1,226,626 1,017,145 968,967
Gross profit 120,263 123,528 111,873 86,639 94,384 105,230 93,536 79,235 442,303 372,385 347,046
Selling, general and administrative expenses 93,710 90,767 89,339 88,432 79,217 77,634 71,526 72,082 362,248 300,459 282,828
Depreciation and amortization 5,339 4,771 5,203 5,159 4,733 4,660 4,729 4,768 20,472 18,890 16,384
Income from operations 21,214 27,990 17,331 (6,952) 10,434 22,936 17,281 2,385 59,583 53,036 47,834
Interest expense (329) (350) (336) (233) (230) (266) (244) (391) (1,248) (1,131) (1,207)
Interest and other income 515 766 611 710 714 675 656 655 2,602 2,700 2,697
Interest and other income, net 186 416 275 477 484 409 412 264 1,354 1,569 1,490
Income (loss) before tax expense 21,400 28,406 17,606 (6,475) 10,918 23,345 17,693 2,649 60,937 54,605 49,324
Income tax expense 6,889 9,454 5,069 (5,399) 3,503 8,998 7,356 1,119 16,013 20,976 18,533
Net income $ 14,511 $ 18,952 $ 12,537 $ (1,076) $ 7,415 $ 14,347 $ 10,337 $ 1,530 $ 44,924 $ 33,629 $ 30,791
Net income per common share:                      
Basic (in dollars per share) $ 0.36 $ 0.47 $ 0.31 $ (0.03) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 1.12 $ 0.85 $ 0.73
Diluted (in dollars per share) $ 0.36 $ 0.47 $ 0.31 $ (0.03) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 1.11 $ 0.84 $ 0.73