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Employee Retirement Plan - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Vesting period, in years 3 years    
Discretionary plan contribution $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 0.2us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Years One Through Three      
Defined Benefit Plan Disclosure [Line Items]      
Annual vesting percentage 33.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
/ us-gaap_VestingAxis
= amcc_YearsOneThroughThreeMember		    
Years Four and Thereafter      
Defined Benefit Plan Disclosure [Line Items]      
Annual vesting percentage 100.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
/ us-gaap_VestingAxis
= amcc_YearsFourAndThereafterMember		    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Maximum annual contribution per employee 1.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Maximum annual contribution per employee 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember