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Certain Financial Statement Information - Schedule of Other assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Schedule of other assets      
Non-current portion of prepaid expenses $ 1,974us-gaap_PrepaidExpenseNoncurrent $ 4,235us-gaap_PrepaidExpenseNoncurrent  
Strategic investments 0us-gaap_CostMethodInvestments [1] 3,000us-gaap_CostMethodInvestments [1]  
Other 596amcc_OtherNoncurrentAssets 519amcc_OtherNoncurrentAssets  
Total other assets 2,570us-gaap_OtherAssetsNoncurrent 7,754us-gaap_OtherAssetsNoncurrent  
Impairment of strategic investments $ 3,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet $ 2,250us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
[1] During the fiscal year ended March 31, 2015, the Company recorded other-than-temporary impairment charges of $3.0 million with respect to two of its strategic investments. Refer to Note 1, Summary of Significant Accounting Policies, to the Consolidated Financial Statements for details.