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Marketable Securities (Narrative) (Details) (USD $) | Mar. 28, 2015 security | Mar. 29, 2014 security
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Marketable Securities [Abstract] |  |
Gross Unrealized Losses | $ (83,000)crus_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | $ (253,000)crus_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Amortized cost on available for sale securities held at gross unrealized loss | $ 154,300,000 crus_AvailableForSaleSecuritiesAmortizedCostOnGrossUnrealizedLosses | $ 207,800,000 crus_AvailableForSaleSecuritiesAmortizedCostOnGrossUnrealizedLosses
Number of securities | 34 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 | 74 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amortized cost of available for sale securities in an unrealized loss position. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Details
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