The element that represents IPR&D that was reclassed to existing technology during the period.

No definition available.

Name:	exar_IPRDReclassedToExistingTechnology
Namespace Prefix:	exar_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	exar_Note6GoodwillandIntangibleAssetsDetailsLineItems
Namespace Prefix:	exar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=exar_CadekaMicrocircuitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=exar_IntegratedMemoryLogicLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=exar_StretchIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=exar_ExistingTechnologyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DistributionRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentedTechnologyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 6 - Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Dec. 28, 2014	Sep. 15, 2014	Jul. 05, 2013	Mar. 30, 2014	Jan. 14, 2014
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Number of Operating Segments			1us-gaap_NumberOfOperatingSegments
IPR&D Reclassed to Existing Technology (in Dollars)	$ 1,200,000exar_IPRDReclassedToExistingTechnology
Impairment of Intangible Assets (Excluding Goodwill) (in Dollars)		12,300,000	12,284,000
Existing Technology [Member] \| Minimum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years
Existing Technology [Member] \| Maximum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			9 years
Customer Relationships [Member] \| Minimum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Customer Relationships [Member] \| Maximum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Distribution Rights [Member] \| Minimum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Distribution Rights [Member] \| Maximum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Patented Technology [Member] \| Minimum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Patented Technology [Member] \| Maximum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Trade Names [Member] \| Minimum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years
Trade Names [Member] \| Maximum [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years
Integrated Memory Logic Limited [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Goodwill, Acquired During Period (in Dollars)			14,500,000	14,500,000
Cadeka Microcircuits [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Goodwill, Acquired During Period (in Dollars)					19,400,000	19,400,000
Stretch, Inc. [Member]
Note 6 - Goodwill and Intangible Assets (Details) [Line Items]
Goodwill, Acquired During Period (in Dollars)						$ 700,000	$ 700,000