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Acquisition (Narrative) (Details)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended 9 Months Ended
Dec. 27, 2014
USD ($)
Dec. 28, 2013
USD ($)
Sep. 27, 2014
USD ($)
Dec. 27, 2014
USD ($)
Dec. 28, 2013
USD ($)
Aug. 21, 2014
USD ($)
Aug. 21, 2014
GBP (£)
Apr. 29, 2014
USD ($)
Apr. 29, 2014
GBP (£)
Mar. 29, 2014
USD ($)
Dec. 27, 2014
Wolfson [Member]
USD ($)
Sep. 27, 2014
Wolfson [Member]
USD ($)
Business Acquisition [Line Items]                        
Enterprise value           $ 469,000crus_EnterpriseValue £ 283,000crus_EnterpriseValue          
Foreign currency exchange rate, translation           1.659us-gaap_ForeignCurrencyExchangeRateTranslation1   1.682us-gaap_ForeignCurrencyExchangeRateTranslation1        
Business acquisition, share price                 £ 2.35us-gaap_BusinessAcquisitionSharePrice      
Line of credit facility maximum borrowing capacity           225,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity            
Acquisition foreign currency transaction loss     12,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax                  
Goodwill 264,879us-gaap_Goodwill     264,879us-gaap_Goodwill           16,367us-gaap_Goodwill 248,512us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
249,043us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Acquisition related costs 3,200us-gaap_BusinessCombinationAcquisitionRelatedCosts     18,137us-gaap_BusinessCombinationAcquisitionRelatedCosts                
Restructuring and other   12us-gaap_RestructuringSettlementAndImpairmentProvisions   1,455us-gaap_RestructuringSettlementAndImpairmentProvisions (572)us-gaap_RestructuringSettlementAndImpairmentProvisions              
Net sales 298,606us-gaap_SalesRevenueNet 218,883us-gaap_SalesRevenueNet   661,385us-gaap_SalesRevenueNet 564,679us-gaap_SalesRevenueNet           43,800us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Business Acquisition, Pro Forma Revenue       $ 88,000us-gaap_BusinessAcquisitionsProFormaRevenue