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Note 4 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Unbilled AR, beginning balance | $ 5,765 | $ 5,711
Deferred Program Costs, beginning balance | 977 | 1,631
Contract Liabilities, beginning balance | (21,257) | (26,142)
Increases for balances acquired | 634 |
Increases for balances acquired | 10,048 | (2,700)
Deferred Program Costs, increases for costs incurred to fulfill performance obligations | 4,814 | 7,674
Unbilled AR, increase (decrease) due to customer billings | (16,125) | (8,687)
Increase (decrease) due to customer billings | 68,895 | (52,988)
Deferred Program Costs, decrease due to cost recognition on completed performance obligations | (5,551) | (8,346)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations | 16,852 | 8,640
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations | 70,141 |
Deferred Program Costs, other changes and FX impact | (16) | 18
Other changes and FX impact | (25) | 610
Contract Liabilities, beginning balance | 21,257 | 26,142
Increases for balances acquired |  | 101
Increases for balances acquired | (10,048) | 2,700
Increase (decrease) due to customer billings | (68,895) | 52,988
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  | (61,183)
Unbilled AR, ending balance | 6,492 | 5,765
Deferred Program Costs, ending balance | 858 | 977
Contract Liabilities, ending balance | $ 30,034 | $ 21,257

X
- Definition Represents the change in contract costs attributable to deferred program costs related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsChangeInContractCosts
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of contract costs recognized from deferred program costs, with regard to asset from contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsContractCostsRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in deferred program costs from balances acquired. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsIncreaseForBalancesAcquired
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net deferred program costs related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the change in the asset from contract with customer, attributable to other changes in deferred program costs. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetDeferredProgramCostsOtherChanges
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the revenue recognized from performance obligation satisfied from change in time frame of unbilled AR related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARChangeInTimeFramePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net unbilled AR related to contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the change in the asset from the contract with customer from revenue recognized on unbilled accounts receivable. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledARRevenueRecognized
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in unbilled accounts receivable for balances acquired. + References No definition available. + Details
Name: | amsc_ContractWithCustomerAssetUnbilledArIncreaseDecreasesForBalancesAcquired
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents other changes in the liability from contract with customer. + References No definition available. + Details
Name: | amsc_ContractWithCustomerLiabilityOtherChanges
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of revenue recognized from performance obligations under contract with customer liability. + References No definition available. + Details
Name: | amsc_ContractWithCustomerLiabilityRevenueRecognizedFromPerformanceObligations
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration