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Basis of presentation - additional information (Detail) (Reclassifications, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 30, 2014
Reclassifications
 
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]  
Tax withholding obligations for share based compensation $ 8.3us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember