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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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 469,000,000 crus_EnterpriseValue | £ 283,000,000 crus_EnterpriseValue |  |
Business Acquisition, Share Price |  |  |  |  |  |  |  |  |  |  |  |  | £ 2.35 us-gaap_BusinessAcquisitionSharePrice |  |  |  |
Borrowing limit under the revolving credit facility | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  |  |  | 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  | 225,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_BusinessAcquisitionAxis = crus_WellsFargoInterimCreditFacilityMember
Acquisition foreign currency transaction loss |  |  |  |  |  |  |  |  | 12,000,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |  |  |  |  |
Goodwill | 263,115,000 us-gaap_Goodwill |  |  |  | 16,367,000 us-gaap_Goodwill |  |  |  |  | 263,115,000 us-gaap_Goodwill | 16,367,000 us-gaap_Goodwill |  |  |  |  | 246,748,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = crus_WolfsonMember |
Acquisition related costs |  |  |  |  |  |  |  |  |  | 18,137,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |  |  |  |
Restructuring and other, net |  |  |  |  |  |  |  |  |  | 1,455,000 us-gaap_RestructuringSettlementAndImpairmentProvisions | (598,000)us-gaap_RestructuringSettlementAndImpairmentProvisions | 3,292,000 us-gaap_RestructuringSettlementAndImpairmentProvisions |  |  |  |  |
Net sales | 255,183,000 us-gaap_SalesRevenueNet | 298,606,000 us-gaap_SalesRevenueNet | 210,214,000 us-gaap_SalesRevenueNet | 152,565,000 us-gaap_SalesRevenueNet | 149,659,000 us-gaap_SalesRevenueNet | 218,883,000 us-gaap_SalesRevenueNet | 190,671,000 us-gaap_SalesRevenueNet | 155,125,000 us-gaap_SalesRevenueNet |  | 916,568,000 us-gaap_SalesRevenueNet | 714,338,000 us-gaap_SalesRevenueNet | 809,786,000 us-gaap_SalesRevenueNet |  |  |  | 98,300,000 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = crus_WolfsonMember |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  | $ 142,500,000 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 179,400,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  |  |  |  |

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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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