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Summary of Significant Accounting Policies - Mask Costs (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Capitalized mask costs	$ 5,900,000amcc_CapitalizedMaskCosts	$ 6,400,000amcc_CapitalizedMaskCosts
Impairment of capitalized mask costs		0
January 2015 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Impairment of capitalized mask costs	$ 2,600,000

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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