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Note 13 - Net Income (Loss) Per Share (Details) - Summary of Net Income (Loss) per Share (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 28, 2014
Dec. 29, 2013
Summary of Net Income (Loss) per Share [Abstract]        
Net income (loss) attributable to Exar Corporation (in Dollars) $ (6,599)us-gaap_NetIncomeLoss $ (1,634)us-gaap_NetIncomeLoss $ (42,056)us-gaap_NetIncomeLoss $ 5,654us-gaap_NetIncomeLoss
Shares used in computation of net income (loss) per share:        
Basic 47,119us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 47,529us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 47,165us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 47,277us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of options and awards       1,538us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted 47,119us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 47,529us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 47,165us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 48,815us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share        
Basic (in Dollars per share) $ (0.14)us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic $ (0.89)us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) $ (0.14)us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.89)us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted