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Restructuring Charges (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 28, 2013
Deferred rent and other non-current liabilities
Dec. 28, 2013
Current portion of deferred rent
Dec. 28, 2013
Office Vacancies
Dec. 29, 2012
Office Vacancies
Dec. 28, 2013
Employee Workforce Reduction
Dec. 29, 2012
Employee Workforce Reduction
Jun. 30, 2012
London office surrender
Dec. 29, 2012
London office surrender
item
Jun. 30, 2012
London office surrender
Lease surrender
Jun. 30, 2012
London office surrender
Other restructuring
Dec. 29, 2012
Houston office space adjustments
Dec. 29, 2012
Houston office space adjustments
Cost of sales
Dec. 29, 2012
Houston office space adjustments
Selling, general and administrative expenses
Dec. 29, 2012
Houston office space adjustments
Depreciation and amortization expense
Dec. 28, 2013
Restructuring Plan, July 2012
Minimum
service
Restructuring charges disclosures                                  
Restructuring charges related to termination benefits, facility related charges, asset write downs and other charges   $ 5,400,000                              
Number of consulting positions reduced under the plan                                 60
Number of floors under lease surrendered                   1              
Number of floors under lease                   3              
Amount paid for lease surrender 1,488,000 7,232,000     759,000 3,514,000 729,000 3,718,000     1,200,000            
Pre-tax restructuring credit related to adjustments of leased office space in Houston, TX                         400,000        
Restructuring expenses and reserve balance                                  
Balance at the beginning of the period 2,979,000 3,737,000 400,000 800,000 2,106,000 3,737,000 873,000 0                  
Charges incurred 0 6,728,000     0 2,110,000 0 4,618,000 1,700,000     500,000 6,700,000 3,800,000 1,500,000 1,400,000  
Amounts paid, net of amounts received, during fiscal 2013 (1,488,000) (7,232,000)     (759,000) (3,514,000) (729,000) (3,718,000)     (1,200,000)            
Non-cash adjustments and effect of foreign currency translation (321,000) (254,000)     (177,000) (227,000) (144,000) (27,000)                  
Balance at the end of the period $ 1,170,000 $ 2,979,000 $ 400,000 $ 800,000 $ 1,170,000 $ 2,106,000 $ 0 $ 873,000