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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014
Income Taxes [Line Items] |  |
Increase (decrease) in valuation allowance | $ 1,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Net operating loss included in deferred tax assets | 57,878,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 29,062,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Unrecognized tax benefit | 0 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits
Accrued interest and penalties | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |
Interest and penalties incurred during period | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Federal [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 26,200,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Section 382 Of Internal Revenue Code [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 26,200,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = crus_SectionThreeEightTwoOfInternalRevenueCodeMember |
Non-U.S [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 147,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
State [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 88,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Research Tax Credit Carryforward [Member] | Federal [Member] |  |
Income Taxes [Line Items] |  |
Tax credit carryforward | 5,100,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |
Research Tax Credit Carryforward [Member] | State [Member] |  |
Income Taxes [Line Items] |  |
Tax credit carryforward | 14,600,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |
Tax credit carryforward subject to expiration | 2,900,000 crus_TaxCreditCarryforwardAmountSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |
Tax credit carryforward not subject to expiration | $ 11,700,000 crus_TaxCreditCarryforwardAmountNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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