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CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Revenue from services $ 1,389,530 $ 1,316,013 $ 1,149,367
Cost of services 1,017,145 968,967 845,916
Gross profit 372,385 347,046 303,451
Selling, general and administrative expenses 300,459 282,828 258,722
Depreciation and amortization 18,890 16,384 16,468
Income from operations 53,036 47,834 28,261
Interest expense (1,131) (1,207) (1,515)
Interest and other income 2,700 2,697 2,416
Interest and other income, net 1,569 1,490 901
Income before tax expense 54,605 49,324 29,162
Income tax expense 20,976 18,533 9,323
Net income 33,629 30,791 19,839
Net income per common share:      
Basic (in dollars per share) $ 0.85 $ 0.73 $ 0.46
Diluted (in dollars per share) $ 0.84 $ 0.73 $ 0.46
Weighted average shares outstanding:      
Basic (in shares) 39,548 41,961 43,224
Diluted (in shares) 39,862 42,322 43,540
Total other comprehensive income, net of tax:      
Foreign currency translation 175 (263) 631
Comprehensive income $ 33,804 $ 30,528 $ 20,470