No definition available.

Name:	amsc_CounterclaimForDamagesSought
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Damages claimed for unauthorized use of software.

No definition available.

Name:	amsc_DamagesClaimedForUnauthorizedUseOfSoftware
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Loss contingency interest rate.

No definition available.

Name:	amsc_LossContingencyInterestRate
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Loss contingency number of claims consolidated.

No definition available.

Name:	amsc_LossContingencyNumberOfClaimsConsolidated
Namespace Prefix:	amsc_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

Loss contingency recorded in prior period.

No definition available.

Name:	amsc_LossContingencyRecordedInPriorPeriod
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Monetary damages for trade secret infringement.

No definition available.

Name:	amsc_MonetaryDamagesForTradeSecretInfringement
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Balance Type:	credit
Period Type:	duration

Monetary Losses From Copyright Infringement

No definition available.

Name:	amsc_MonetaryLossesFromCopyrightInfringement
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Number of complaints additionally asserted claims against the underwriters.

No definition available.

Name:	amsc_NumberOfComplaintAdditionallyAssertedClaimsAgainstUnderwriters
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Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

Number of officers putative securities filed against

No definition available.

Name:	amsc_NumberOfOfficersPutativeSecuritiesFiledAgainst
Namespace Prefix:	amsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Settlement amount expected to be paid by issuance of common stock.

No definition available.

Name:	amsc_SettlementAmountExpectedToBePaidByIssuanceOfCommonStock
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Shortfall payment.

No definition available.

Name:	amsc_ShortfallPayment
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

No definition available.

Name:	amsc_SupplyCommitmentRemainingMinimumAmountCommitted
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Aggregate number of common shares reserved for future issuance.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

No definition available.

Name:	us-gaap_InsuranceSettlementsReceivable
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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Amount of damages awarded to the plaintiff in the legal matter.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

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-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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The total number of new claims filed pertaining to a loss contingency during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Publisher SEC

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

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-Topic 944

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.