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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Percentage of common stock matched under deferred compensation plan	50.00%amsc_DefinedContributionPlanCompanyContributionPercentageMatchCommonStock
First certain percentage of eligible contribution under deferred compensation plan	6.00%amsc_DefinedContributionPlanPercentageOfFirstEligibleEmployeeContributionMatchedByEmployer
Recorded expense under deferred compensation plan	$ 0.4us-gaap_DefinedContributionPlanCostRecognized	$ 0.4us-gaap_DefinedContributionPlanCostRecognized	$ 0.5us-gaap_DefinedContributionPlanCostRecognized

X

- Definition

Defined Contribution Plan Company Contribution Percentage Match Common Stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	amsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined contribution plan percentage of first eligible employee contribution matched by employer

+ References

No definition available.

+ Details

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Namespace Prefix:	amsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Period Type:	duration

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- Details

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