Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2016	Jan. 01, 2016
Consolidated Balance Sheets [Abstract]
Accounts receivable and unbilled revenue, allowance	$ 2,246	$ 1,881
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,250,000	1,250,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	54,599,310	53,847,479
Treasury stock, at cost, shares	24,446,065	24,138,694