Restructuring Costs and Other Severance Related Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Restructuring charges and subsequent activity in restructuring accrual
Balance at the beginning of the period	$ 470	$ 506	$ 3,083
Restructuring charges (reversals)	113	769	(300)
Cash expenditures	(583)	(805)	(2,277)
Balance at the end of the period		470	506
Workforce Reduction
Restructuring charges and subsequent activity in restructuring accrual
Balance at the beginning of the period	179	22	1,215
Restructuring charges (reversals)	113	370	413
Cash expenditures	(292)	(213)	(1,606)
Balance at the end of the period		179	22
Office Closure/Consolidation
Restructuring charges and subsequent activity in restructuring accrual
Balance at the beginning of the period	291	484	1,868
Restructuring charges (reversals)		399	(713)
Cash expenditures	(291)	(592)	(671)
Balance at the end of the period		$ 291	$ 484