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

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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

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

Name:	us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
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

Name:	us-gaap_PurchaseObligation
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