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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. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 30, 2011
Jul. 01, 2011
Apr. 01, 2011
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Selected Quarterly Financial Information [Abstract]                      
Revenue from services $ 344,600 $ 379,400 $ 354,200 $ 311,200 $ 350,200 $ 371,400 $ 320,200 $ 274,300 $ 1,389,530 $ 1,316,013 $ 1,149,367
Cost of services 250,200 274,200 260,700 232,000 258,300 271,600 234,900 204,300 1,017,145 968,967 845,916
Gross profit 94,400 105,200 93,500 79,200 91,900 99,800 85,300 70,000 372,385 347,046 303,451
Selling, general and administrative expenses 79,200 77,600 71,500 72,100 76,800 73,200 67,700 65,100 300,459 282,828 258,722
Depreciation and amortization 4,700 4,700 4,700 4,800 4,400 4,200 3,800 3,900 18,890 16,384 16,468
Income from operations 10,500 22,900 17,300 2,300 10,700 22,400 13,800 1,000 53,036 47,834 28,261
Interest expense (300) (300) (300) (400) (100) (400) (400) (300) (1,131) (1,207) (1,515)
Interest and other income 700 700 700 700 800 700 600 600 2,700 2,697 2,416
Interest and other income, net 400 400 400 300 700 300 200 300 1,569 1,490 901
Income before tax expense 10,900 23,300 17,700 2,600 11,400 22,700 14,000 1,300 54,605 49,324 29,162
Income tax expense 3,500 9,000 7,400 1,100 3,800 8,800 5,400 500 20,976 18,533 9,323
Net income $ 7,400 $ 14,300 $ 10,300 $ 1,500 $ 7,600 $ 13,900 $ 8,600 $ 800 $ 33,629 $ 30,791 $ 19,839
Net income per common share:                      
Basic (in dollars per share) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 0.19 $ 0.33 $ 0.20 $ 0.02 $ 0.85 $ 0.73 $ 0.46
Diluted (in dollars per share) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 0.19 $ 0.33 $ 0.20 $ 0.02 $ 0.84 $ 0.73 $ 0.46