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Acquisition (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Mar. 28, 2015
USD ($)
Dec. 27, 2014
USD ($)
Sep. 27, 2014
USD ($)
Jun. 28, 2014
USD ($)
Mar. 29, 2014
USD ($)
Dec. 28, 2013
USD ($)
Sep. 28, 2013
USD ($)
Jun. 29, 2013
USD ($)
Sep. 27, 2014
USD ($)
Mar. 28, 2015
USD ($)
Mar. 29, 2014
USD ($)
Mar. 30, 2013
USD ($)
Aug. 29, 2014
GBP (£)
Aug. 21, 2014
USD ($)
Aug. 21, 2014
GBP (£)
Mar. 28, 2015
Wolfson [Member]
USD ($)
Apr. 29, 2014
Wells Fargo interim credit facility [Member]
USD ($)
Enterprise Value                           $ 469,000,000crus_EnterpriseValue £ 283,000,000crus_EnterpriseValue    
Business Acquisition, Share Price                         £ 2.35us-gaap_BusinessAcquisitionSharePrice        
Borrowing limit under the revolving credit facility 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity                 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity             225,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_BusinessAcquisitionAxis
= crus_WellsFargoInterimCreditFacilityMember
Acquisition foreign currency transaction loss                 12,000,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax                
Goodwill 263,115,000us-gaap_Goodwill       16,367,000us-gaap_Goodwill         263,115,000us-gaap_Goodwill 16,367,000us-gaap_Goodwill         246,748,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= crus_WolfsonMember
 
Acquisition related costs                   18,137,000us-gaap_BusinessCombinationAcquisitionRelatedCosts              
Restructuring and other, net                   1,455,000us-gaap_RestructuringSettlementAndImpairmentProvisions (598,000)us-gaap_RestructuringSettlementAndImpairmentProvisions 3,292,000us-gaap_RestructuringSettlementAndImpairmentProvisions          
Net sales 255,183,000us-gaap_SalesRevenueNet 298,606,000us-gaap_SalesRevenueNet 210,214,000us-gaap_SalesRevenueNet 152,565,000us-gaap_SalesRevenueNet 149,659,000us-gaap_SalesRevenueNet 218,883,000us-gaap_SalesRevenueNet 190,671,000us-gaap_SalesRevenueNet 155,125,000us-gaap_SalesRevenueNet   916,568,000us-gaap_SalesRevenueNet 714,338,000us-gaap_SalesRevenueNet 809,786,000us-gaap_SalesRevenueNet       98,300,000us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= crus_WolfsonMember
 
Business Acquisition, Pro Forma Revenue                   $ 142,500,000us-gaap_BusinessAcquisitionsProFormaRevenue $ 179,400,000us-gaap_BusinessAcquisitionsProFormaRevenue