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Restructuring Charges (Details) (USD $)
 3 Months Ended 9 Months Ended 10 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended 9 Months Ended 10 Months Ended 1 Months Ended
Sep. 29, 2012
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Cost of sales
Sep. 29, 2012
Selling, general and administrative expenses
Sep. 29, 2012
Facility-Related Costs
Oct. 01, 2011
Facility-Related Costs
Sep. 29, 2012
Facility-Related Costs
Deferred rent and other non-current liabilities
Sep. 29, 2012
Facility-Related Costs
Current portion of deferred rent
Sep. 29, 2012
Facility-Related Costs
Accrued expenses
Sep. 29, 2012
Employee Workforce Reduction
Oct. 01, 2011
Employee Workforce Reduction
Jul. 31, 2012
Minimum
item
Restructuring Charges                          
Number of consulting positions reduced under the plan                         60
Restructuring expenses and the reserve balance                          
Balance at the beginning of the period   $ 3,737,000 $ 5,427,000     $ 3,737,000 $ 4,476,000 $ 1,400,000 $ 1,400,000 $ 1,900,000 $ 0 $ 951,000  
Charges incurred 4,400,000 6,340,000 1,020,000 3,400,000 1,000,000 2,101,000 1,020,000       4,239,000 0  
Amounts paid, net of amounts received   (4,813,000) (2,226,000)     (2,441,000) (1,569,000)       (2,372,000) (657,000)  
Non-cash adjustments and effect of foreign currency translation   (603,000) (363,000)     (575,000) (69,000)       (28,000) (294,000)  
Balance at the end of the period 4,661,000 4,661,000 3,858,000     2,822,000 3,858,000 1,400,000 1,400,000 1,900,000 1,839,000 0  
Pre-tax restructuring credit related to adjustments of leased office space in Houston, TX             $ 1,000,000