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Stockholders' Equity - Employee Stock Purchase Plan (Details)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Aug. 31, 2014
Aug. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for issuance 10,291,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance      
2012 Plan | Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional common stock reserved for future issuance     2,000,000amcc_CommonStockCapitalSharesReservedforFutureIssuanceIncreaseinNumber
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember
1,800,000amcc_CommonStockCapitalSharesReservedforFutureIssuanceIncreaseinNumber
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember
Percentage of purchase price of common stock equal to fair market value 85.00%amcc_PercentageOfPurchasePriceOfCommonStockEqualToFairMarketValue
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember
     
Common stock, shares issued, employee stock purchase plan 700,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember
700,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember
   
Shares available for future issuance 1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= amcc_EmployeeStockPurchasePlanMember
/ us-gaap_PlanNameAxis
= amcc_TwoThousandTwelvePlanMember