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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS      
Revenues $ 370,075 $ 324,779 $ 303,559
Costs of services (exclusive of depreciation and amortization) 258,829 227,380 207,650
Selling, general and administrative expenses 86,537 70,584 72,439
Depreciation and amortization 8,945 7,896 6,552
GNU goodwill impairment     4,524
Income from operations 15,764 18,919 12,394
GNU gain on extinguishment of debt     606
GNU gain on sale of business assets 250 3,836  
Interest expense, net (484) (469) (538)
Other expense, net (366) (397) (647)
Income before provision for income taxes 15,164 21,889 11,815
Provision for income taxes (7,463) (7,656) (5,490)
Net income 7,701 14,233 6,325
Net (income) loss attributable to noncontrolling interest, net of tax (77) (1,345) 1,332
Net income attributable to CRA International, Inc. $ 7,624 $ 12,888 $ 7,657
Net income per share attributable to CRA International, Inc.:      
Basic (in dollars per share) $ 0.91 $ 1.50 $ 0.84
Diluted (in dollars per share) $ 0.89 $ 1.49 $ 0.83
Weighted average number of shares outstanding:      
Basic (in shares) 8,292 8,503 9,010
Diluted (in shares) 8,497 8,601 9,195