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Share-Based Compensation - Unrecognized Share-based Compensation Expense (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized share-based compensation expense $ 17.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized share-based compensation expense 3.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average years expected to recognize compensation 2 years 3 months 18 days
Performance-Based RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized share-based compensation expense 9.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted average years expected to recognize compensation 2 years 7 months 6 days
Time-Based RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized share-based compensation expense $ 4.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average years expected to recognize compensation 2 years