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Restructuring - Additional Information (Details) (USD $)
3 Months Ended 12 Months Ended 9 Months Ended 8 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Sep. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2014
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]                
Restructuring charges $ 4,100,000us-gaap_RestructuringCharges $ 1,200,000us-gaap_RestructuringCharges $ 1,000,000us-gaap_RestructuringCharges $ 5,421,000us-gaap_RestructuringCharges $ 1,134,000us-gaap_RestructuringCharges $ 6,435,000us-gaap_RestructuringCharges    
Write off of fixed asset         0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse      
Workforce Reduction                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges       2,613,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
862,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
     
January 2015 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Number of positions eliminated or relocated under restructuring program       40us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
Number of positions eliminated or relocated under restructuring program (percentage)       7.00%amcc_RestructuringandRelatedCostExpectedNumberofPositionsEliminatedPercent
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
Restructuring charges       4,100,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
Write off of fixed asset       2,600,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
Restructuring costs remaining 100,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
    100,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
January 2015 Restructuring Plan | Minimum                
Restructuring Cost and Reserve [Line Items]                
Expected reduction in operating expenses 14,000,000amcc_RestructuringandRelatedCostExpectedImpactReductioninOperatingExpenses
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
    14,000,000amcc_RestructuringandRelatedCostExpectedImpactReductioninOperatingExpenses
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
January 2015 Restructuring Plan | Maximum                
Restructuring Cost and Reserve [Line Items]                
Expected reduction in operating expenses 18,000,000amcc_RestructuringandRelatedCostExpectedImpactReductioninOperatingExpenses
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
    18,000,000amcc_RestructuringandRelatedCostExpectedImpactReductioninOperatingExpenses
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringPlanAxis
= amcc_January2015RestructuringPlanMember
       
April 2014 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges             1,300,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= amcc_April2014RestructuringProgramMember
 
April 2014 Restructuring Plan | Workforce Reduction                
Restructuring Cost and Reserve [Line Items]                
Actual annual savings       4,600,000amcc_RestructuringandRelatedCostActualImpactReductioninOperatingExpenses
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= amcc_April2014RestructuringProgramMember
       
April 2014 Restructuring Plan | Other Expense                
Restructuring Cost and Reserve [Line Items]                
Actual annual savings       600,000amcc_RestructuringandRelatedCostActualImpactReductioninOperatingExpenses
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherExpenseMember
/ us-gaap_RestructuringPlanAxis
= amcc_April2014RestructuringProgramMember
       
August 2013 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Number of positions eliminated or relocated under restructuring program           20us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= amcc_August2013RestructuringProgramMember
   
Restructuring charges               1,000,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= amcc_August2013RestructuringProgramMember
December 2012 Restructuring Plan                
Restructuring Cost and Reserve [Line Items]                
Number of positions eliminated or relocated under restructuring program           70us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= amcc_December2012RestructuringProgramMember
   
December 2012 Restructuring Plan | Workforce Reduction | Maximum                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           1,800,000us-gaap_RestructuringCharges
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= amcc_December2012RestructuringProgramMember
   
December 2012 Restructuring Plan | Asset Impairment | Minimum                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 4,700,000us-gaap_RestructuringCharges
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RestructuringCostAndReserveAxis
= amcc_ImpairmentOfIntangibleAssetsFiniteLivedAsResultOfRestructuringMember
/ us-gaap_RestructuringPlanAxis
= amcc_December2012RestructuringProgramMember