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Restructuring - Schedule of Restructuring Charges and Cash Payments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]
Accrued restructuring balance	$ 844us-gaap_RestructuringReserve	$ 199us-gaap_RestructuringReserve
Charges to operations	1,902us-gaap_RestructuringCharges	1,733us-gaap_RestructuringCharges
Cash payments	(2,566)us-gaap_PaymentsForRestructuring	(873)us-gaap_PaymentsForRestructuring
Non-cash/miscellaneous reductions		(215)us-gaap_RestructuringReserveSettledWithoutCash1
Accrued restructuring balance	180us-gaap_RestructuringReserve	844us-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	618us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	1,710us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Cash payments	(1,282)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(836)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Non-cash/miscellaneous reductions		(175)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Accrued restructuring balance	180us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	844us-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	1,284us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember	23us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Cash payments	(1,284)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember	(37)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = amsc_FacilityExitAndRelocationCostsMember
Non-cash/miscellaneous reductions		$ (39)us-gaap_RestructuringReserveSettledWithoutCash1 / 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)

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- Definition

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

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Number Topic 5

-Section P

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X

- 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

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Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

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