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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Dec. 25, 2009
Revenue from services $ 1,316,013 $ 1,149,367 $ 1,018,418
Cost of services 968,967 845,916 727,372
Gross profit 347,046 303,451 291,046
Selling, general and administrative expenses 282,828 258,722 262,182
Depreciation and amortization 16,384 16,468 17,030
Income from operations 47,834 28,261 11,834
Interest expense (1,207) (1,515) (1,491)
Interest and other income 2,697 2,416 3,798
Interest and other income, net 1,490 901 2,307
Income before tax expense 49,324 29,162 14,141
Income tax expense 18,533 9,323 5,344
Net income $ 30,791 $ 19,839 $ 8,797
Net income per common share:      
Basic $ 0.73 $ 0.46 $ 0.21
Diluted $ 0.73 $ 0.46 $ 0.20
Weighted average shares outstanding:      
Basic 41,961 43,224 42,842
Diluted 42,322 43,540 43,014