| Document And Entity Information | Nov. 08, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | American Superconductor Corporation |
| Document, Type | 8-K |
| Document, Period End Date | Nov. 8, 2021 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 000-19672 |
| Entity, Tax Identification Number | 04-2959321 |
| Entity, Address, Address Line One | 114 East Main Street |
| Entity, Address, City or Town | Ayer |
| Entity, Address, State or Province | MA |
| Entity, Address, Postal Zip Code | 01432 |
| City Area Code | 978 |
| Local Phone Number | 842-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | AMSC |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000880807 |
