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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
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Payables And Accruals [Abstract] |  |  |
Accounts payable | $ 7,062 us-gaap_AccountsPayableCurrent | $ 1,749 us-gaap_AccountsPayableCurrent |
Accrued inventories in-transit | 1,127 amsc_AccruedInventoriesInTransit | 212 amsc_AccruedInventoriesInTransit |
Accrued miscellaneous expenses | 2,695 us-gaap_OtherAccruedLiabilitiesCurrent | 5,935 us-gaap_OtherAccruedLiabilitiesCurrent |
Accrued outside services | 582 amsc_AccruedOutsideServices | 3,716 amsc_AccruedOutsideServices |
Accrued subcontractor program costs |  | 290 us-gaap_AccruedProfessionalFeesCurrent |
Accrued compensation | 5,937 us-gaap_EmployeeRelatedLiabilitiesCurrent | 6,080 us-gaap_EmployeeRelatedLiabilitiesCurrent |
Income taxes payable | 278 us-gaap_AccruedIncomeTaxesCurrent | 173 us-gaap_AccruedIncomeTaxesCurrent |
Accrued adverse purchase commitments |  | 402 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted |
Accrued warranty | 3,934 us-gaap_ProductWarrantyAccrualClassifiedCurrent | 3,207 us-gaap_ProductWarrantyAccrualClassifiedCurrent | 2,709 us-gaap_ProductWarrantyAccrualClassifiedCurrent
Total | $ 21,615 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent | $ 21,764 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent |

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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