Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 02, 2015	Jan. 02, 2015
Consolidated Balance Sheets [Abstract]
Accounts receivable and unbilled revenue, allowance	$ 1,211	$ 1,330
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	53,504,524	52,836,011
Treasury stock, at cost, shares	24,138,694	23,989,776