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Accrued Expenses (Details) (USD $)
Apr. 04, 2015
Jan. 03, 2015
Accrued Expenses.    
Compensation and related expenses $ 38,497,000us-gaap_EmployeeRelatedLiabilitiesCurrent $ 61,527,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Income taxes payable 698,000us-gaap_TaxesPayableCurrent 490,000us-gaap_TaxesPayableCurrent
Other 5,207,000us-gaap_OtherAccruedLiabilitiesCurrent 4,531,000us-gaap_OtherAccruedLiabilitiesCurrent
Total 44,402,000us-gaap_AccruedLiabilitiesCurrent 66,548,000us-gaap_AccruedLiabilitiesCurrent
Accrued bonuses $ 22,900,000us-gaap_AccruedBonusesCurrent $ 49,200,000us-gaap_AccruedBonusesCurrent