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Income Taxes - Income Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
Tax at federal statutory rate                 $ (17,838)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (1,776)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (47,134)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax benefit from loss from continuing operations                 0amcc_IncomeTaxReconciliationIncomeTaxExpenseBenefitContinuingOperations 0amcc_IncomeTaxReconciliationIncomeTaxExpenseBenefitContinuingOperations (925)amcc_IncomeTaxReconciliationIncomeTaxExpenseBenefitContinuingOperations
Other permanent differences                 979us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther (6,561)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 1,195us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
State taxes, net of federal benefit                 (2,345)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (214)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (7,263)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Federal tax credits                 (1,553)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederal (1,778)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederal (1,909)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederal
State tax credits                 (460)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditState (444)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditState (537)amcc_EffectiveIncomeTaxRateReconciliationTaxCreditState
Veloce accrued liability                 3,655amcc_IncomeTaxReconciliationBusinessCombinationsAccruedLiabilities 16,740amcc_IncomeTaxReconciliationBusinessCombinationsAccruedLiabilities 26,749amcc_IncomeTaxReconciliationBusinessCombinationsAccruedLiabilities
Refundable credits                 (16)us-gaap_IncomeTaxReconciliationTaxCredits 0us-gaap_IncomeTaxReconciliationTaxCredits 0us-gaap_IncomeTaxReconciliationTaxCredits
Sale of TPack                 0us-gaap_IncomeTaxReconciliationDispositionOfBusiness 2,688us-gaap_IncomeTaxReconciliationDispositionOfBusiness 0us-gaap_IncomeTaxReconciliationDispositionOfBusiness
Valuation allowance                 18,445us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (7,809)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 28,715us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in contingency reserve                 (67)us-gaap_IncomeTaxReconciliationTaxContingencies (64)us-gaap_IncomeTaxReconciliationTaxContingencies 74us-gaap_IncomeTaxReconciliationTaxContingencies
Other                 292us-gaap_IncomeTaxReconciliationOtherAdjustments (163)us-gaap_IncomeTaxReconciliationOtherAdjustments 481us-gaap_IncomeTaxReconciliationOtherAdjustments
Total current and deferred $ 99us-gaap_IncomeTaxExpenseBenefit [1] $ 862us-gaap_IncomeTaxExpenseBenefit $ 272us-gaap_IncomeTaxExpenseBenefit [2] $ (141)us-gaap_IncomeTaxExpenseBenefit [3] $ 38us-gaap_IncomeTaxExpenseBenefit [4] $ 201us-gaap_IncomeTaxExpenseBenefit [5] $ 192us-gaap_IncomeTaxExpenseBenefit [6] $ 188us-gaap_IncomeTaxExpenseBenefit [7] $ 1,092us-gaap_IncomeTaxExpenseBenefit $ 619us-gaap_IncomeTaxExpenseBenefit $ (554)us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent [Abstract]                      
Tax at federal statutory rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax benefit from loss from continuing operations                 0.00%amcc_EffectiveIncomeTaxRateReconciliationIncomeTaxExpenseBenefitContinuingOperations 0.00%amcc_EffectiveIncomeTaxRateReconciliationIncomeTaxExpenseBenefitContinuingOperations 1.00%amcc_EffectiveIncomeTaxRateReconciliationIncomeTaxExpenseBenefitContinuingOperations
Other permanent differences                 (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 129.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
State taxes, net of federal benefit                 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Federal tax credits                 3.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederalPercent 35.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederalPercent 1.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditFederalPercent
State tax credits                 1.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditStatePercent 9.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditStatePercent 0.00%amcc_EffectiveIncomeTaxRateReconciliationTaxCreditStatePercent
Veloce accrued liability                 (7.00%)amcc_EffectiveIncomeTaxRateReconciliationBusinessCombinationsAccruedLiabilities (330.00%)amcc_EffectiveIncomeTaxRateReconciliationBusinessCombinationsAccruedLiabilities (20.00%)amcc_EffectiveIncomeTaxRateReconciliationBusinessCombinationsAccruedLiabilities
Refundable credits                 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Sale of TPack                 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness (53.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness
Valuation allowance                 (36.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 154.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (21.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in contingency reserve                 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Effective income tax rate                 (2.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (12.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Other                 (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
[1] The consolidated operating results for the fourth quarter of fiscal 2015 included a charge of $2.1 million related to the Veloce consideration, a charge of $4.1 million related to restructuring and an impairment charge of $0.5 million related to a strategic investment.
[2] The consolidated operating results for the second quarter of fiscal 2015 included an impairment charge of $2.5 million related to a strategic investment.
[3] The consolidated operating results for the first quarter of fiscal 2015 included a charge of $7.1 million related to the Veloce consideration and a charge of $1.2 million related to restructuring.
[4] The consolidated operating results for the fourth quarter of fiscal 2014 included a gain on sale of building of $25.8 million.
[5] The consolidated operating results for the third quarter of fiscal 2014 included a charge of $2.9 million related to the Veloce consideration.
[6] The consolidated operating results for the second quarter of fiscal 2014 included a charge of $30.4 million related to the Veloce consideration and a charge of $1.0 million related to restructuring.
[7] The consolidated operating results for the first quarter of fiscal 2014 included a charge of $9.3 million related to the Veloce consideration and a gain on sale of TPack of $19.7 million.