Note 13 - Employee Benefit Plans (Details) - Matching Contributions to Exar Savings Plan (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013
Matching Contributions to Exar Savings Plan [Abstract]
Matching contributions	$ 421	$ 373	$ 267

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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