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Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 844us-gaap_RestructuringReserve	$ 199us-gaap_RestructuringReserve
Charges to operations	1,952us-gaap_RestructuringCharges	872us-gaap_RestructuringCharges
Cash payments	(2,015)us-gaap_PaymentsForRestructuring	(858)us-gaap_PaymentsForRestructuring
Other Adjustments		(213)us-gaap_RestructuringReserveAccrualAdjustment
Accrued restructuring balance	781us-gaap_RestructuringReserve
Severance Pay and Benefits
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	844us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	145us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Charges to operations	674us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	849us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Cash payments	(987)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(821)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Other Adjustments		(173)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Accrued restructuring balance	531us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Facility Exit and Relocation Costs
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance		54us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Charges to operations	1,278us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember	23us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Cash payments	(1,028)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember	(37)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Other Adjustments		(40)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Accrued restructuring balance	$ 250us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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-Publisher FASB

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Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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