| Document and Entity Information | Oct. 31, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 31, 2019 |
| Entity Registrant Name | ABIOMED, Inc. |
| Entity Central Index Key | 0000815094 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-09585 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 04-2743260 |
| Entity Address, Address Line One | 22 Cherry Hill Drive |
| Entity Address, City or Town | Danvers |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01923 |
| City Area Code | (978) |
| Local Phone Number | 646-1400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, $0.01 par value |
| Trading Symbol | ABMD |
| Name of each exchange on which registered | NASDAQ |
