Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 28, 2012	Dec. 30, 2011
Consolidated Balance Sheets [Abstract]
Accounts receivable and unbilled revenue, allowance	$ 1,116	$ 799
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,250,000	1,250,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	51,651,142	61,315,237
Common stock, shares outstanding
Treasury stock, at cost	21,171,370	21,171,370