Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2020	Jan. 25, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	ABMD
Entity Registrant Name	ABIOMED, INC.
Entity Central Index Key	0000815094
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--03-31
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Common Stock Shares Outstanding		45,230,966
Entity File Number	001-09585
Entity Tax Identification Number	04-2743260
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
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