XML 52 R40.htm IDEA: XBRL DOCUMENT v3.10.0.1

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2018	Apr. 01, 2018	Mar. 31, 2018
Product Warranty Liability [Line Items]
Revenue recognized, percentage	87.00%
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	2 years
Extended service warranty, term	4 years
Accounting Standards Update 2014-09
Product Warranty Liability [Line Items]
Adjustment to retained earnings (less than)		$ 0.1
Accounting Standards Update 2017-05
Product Warranty Liability [Line Items]
Adjustment to retained earnings (less than)		$ 0.1	$ 0.1

X

- Definition

Extended Service Warranty, Term

+ References

No definition available.

+ Details

Name:	amsc_ExtendedServiceWarrantyTerm
Namespace Prefix:	amsc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage

+ References

No definition available.

+ Details

Name:	amsc_RevenuePerformanceObligationSatisfiedRevenueRecognizedPercentage
Namespace Prefix:	amsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Warranty period.

+ References

No definition available.

+ Details

Name:	amsc_WarrantyPeriod
Namespace Prefix:	amsc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201409Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201705Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: