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Computation of Net (Loss) Income Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract]
Net loss	$ (6,353)us-gaap_NetIncomeLoss	$ (8,417)us-gaap_NetIncomeLoss	$ (45,292)us-gaap_NetIncomeLoss	$ (33,553)us-gaap_NetIncomeLoss
Weighted-average shares of common stock outstanding	91,054amsc_WeightedAverageSharesOfCommonStockOutstanding	64,442amsc_WeightedAverageSharesOfCommonStockOutstanding	83,263amsc_WeightedAverageSharesOfCommonStockOutstanding	62,256amsc_WeightedAverageSharesOfCommonStockOutstanding
Weighted-average shares subject to repurchase	(3,409)us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	(2,133)us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	(979)us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	(1,678)us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
Shares used in per-share calculation ― basic	87,645us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	62,309us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	82,284us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	60,578us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Shares used in per-share calculation ― diluted	87,645us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	62,309us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	82,284us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	60,578us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net loss per share ― basic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic	$ (0.55)us-gaap_EarningsPerShareBasic	$ (0.55)us-gaap_EarningsPerShareBasic
Net loss per share ― diluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted	$ (0.55)us-gaap_EarningsPerShareDiluted	$ (0.55)us-gaap_EarningsPerShareDiluted

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Weighted average shares of common stock outstanding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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