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Legal Matters (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 28, 2015 defendant | Mar. 29, 2014 item defendant
Legal Matters [Abstract] |  |
Number of U.S.Ethernet Innovations lawsuit co-defendants |  | 2 crus_LossContingencyNumberofCoDefendants
Patents allegedly infringed number | 2 crus_PatentsAllegedlyInfringedNumber | 4 crus_PatentsAllegedlyInfringedNumber
Patent infringement settlements, net |  | $ (695)us-gaap_LitigationSettlementAmount

X
- Definition Number of co-defendants in a lawsuit + References No definition available. + Details
Name: | crus_LossContingencyNumberofCoDefendants
Namespace Prefix: | crus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of another entity's patents that the entity has allegedly infringed. + References No definition available. + Details
Name: | crus_PatentsAllegedlyInfringedNumber
Namespace Prefix: | crus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingencyInformationAboutLitigationMattersAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration