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v2.4.1.9

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 272,498 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 260,254 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development and other tax credit carryforwards | 10,655 us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment | 10,613 us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Accruals and reserves | 37,153 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 36,214 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Fixed assets and intangible assets | 2,432 amsc_DeferredTaxAssetsFixedAssetsAndIntangibles | 2,855 amsc_DeferredTaxAssetsFixedAssetsAndIntangibles
Other | 18,514 us-gaap_DeferredTaxAssetsOther | 19,594 us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets | 341,252 us-gaap_DeferredTaxAssetsGross | 329,530 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (294,860)us-gaap_DeferredTaxAssetsValuationAllowance | (282,824)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets | 46,392 us-gaap_DeferredTaxAssetsNet | 46,706 us-gaap_DeferredTaxAssetsNet
Intercompany debt | (36,298)amsc_DeferredTaxLiabilitiesIntercompanyDebt | (36,102)amsc_DeferredTaxLiabilitiesIntercompanyDebt
Other | (10,174)us-gaap_DeferredTaxLiabilitiesOther | (10,641)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (46,472)us-gaap_DeferredTaxLiabilities | (46,743)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities | $ (80)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (37)us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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