v2.4.0.6

Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 26, 2011 | Mar. 27, 2010 | May 01, 2012 Principal Leased Facilities [Member] sqft | May 01, 2012 Headquarters And Engineering Facility [Member] sqft | May 01, 2012 Subleased Facility [Member] sqft | May 01, 2012 Failure Analysis Facility [Member] sqft | Mar. 31, 2012 New Corporate Headquarters [Member] sqft | Mar. 31, 2012 Tucson, Arizona Facility [Member] sqft | Mar. 31, 2012 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member] | Jan. 24, 2012 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member] | Dec. 22, 2011 Capacity Investment And Loading Agreement With STATS ChipPAC Ltd [Member] | Mar. 31, 2012 Foundry Commitments [Member] | Mar. 31, 2012 Assembly Purchase Order Commitments [Member] | Mar. 31, 2012 Outside Test Services Commitments [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of principal leased facilities |  |  |  | 214,000 | 197,000 | 15,000 | 17,000 | 30,000 | 28,000 |  |  |  |  |  |
Expected lease term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Rent expense | $ 4.7 | $ 4.6 | $ 4.4 |  |  |  |  |  |  |  |  |  |  |  |
Sublease rental income | 0.4 | 1.1 | 1.2 |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable purchase commitments |  |  |  |  |  |  |  |  |  |  |  | 10.0 | 46.3 | 1.0 | 2.7
Purchase commitment, initial payment |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Purchase commitment, remaining amount |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Purchase commitment, rebate amount |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |
Purchase commitment, expected rebate to receive |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |
Other open purchase orders | $ 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Expected Lease Term + References No definition available. + Details
Name: | crus_ExpectedLeaseTerm
Namespace Prefix: | crus_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase Obligation, Expected Rebate Amount + References No definition available. + Details
Name: | crus_PurchaseObligationExpectedRebateAmount
Namespace Prefix: | crus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase Obligation, Initial Payment + References No definition available. + Details
Name: | crus_PurchaseObligationInitialPayment
Namespace Prefix: | crus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Purchase Obligation, Rebate Amount + References No definition available. + Details
Name: | crus_PurchaseObligationRebateAmount
Namespace Prefix: | crus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchase Obligation, Remaining Amount + References No definition available. + Details
Name: | crus_PurchaseObligationRemainingAmount
Namespace Prefix: | crus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature. + 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 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration