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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 28, 2015 | Mar. 29, 2014
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Deferred tax assets: |  |
Inventory valuation | $ 6,377 us-gaap_DeferredTaxAssetsInventory | $ 7,692 us-gaap_DeferredTaxAssetsInventory
Accrued expenses and allowances | 4,705 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 3,905 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Net operating loss carryforwards | 57,878 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 29,062 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development tax credit carryforwards | 14,567 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 15,164 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
State tax credit carryforwards | 225 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 231 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Capitalized research and development | 1,793 us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment | 3,485 us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Other | 30,695 us-gaap_DeferredTaxAssetsOther | 28,627 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 116,240 us-gaap_DeferredTaxAssetsGross | 88,166 us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets | (33,190)us-gaap_DeferredTaxAssetsValuationAllowance | (32,159)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 83,050 us-gaap_DeferredTaxAssetsNet | 56,007 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Depreciation and amortization | 6,827 crus_DeferredTaxLiabilitiesDepreciationAndAmortization | 5,709 crus_DeferredTaxLiabilitiesDepreciationAndAmortization
Acquisition intangibles | 35,242 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 3,209 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liabilities | 42,069 us-gaap_DeferredTaxLiabilities | 8,918 us-gaap_DeferredTaxLiabilities
Total net deferred tax assets | $ 40,981 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 47,089 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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