Acquisitions - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 01, 2014	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Business combination, contingent consideration arrangements, descriptions		With respect to such milestone payments, the share purchase agreement provides: that, upon the earlier of (i) the Company’s receipt of European CE Marking approval relating to the sale of an expandable device based on certain patent rights acquired from ECP, or (ii) the Company’s bringing of a successful claim against a third party competitor (or reaching an economically equivalent settlement) for the infringement of certain patent rights acquired from ECP, it will pay Syscore an additional $7.0 million (provided that if such claim or settlement does not prohibit the third party competitor’s further marketing, production, sale, distribution, lease or use of any violating or infringing products, but only awards monetary damages to the Company or to Abiomed Europe, the amount payable to Syscore shall be limited to the lower of the amount of aggregate damages received and $7.0 million); and that, upon the first to occur of (i) the Company’s successful commercialization of one or more rotatable and expandable devices based on certain patent rights acquired from ECP, where such devices achieve aggregate worldwide revenues of $125.0 million, including the revenues of third-party licensees, or (ii) the Company’s sale of (A) ECP, (B) all or substantially all of ECP’s assets, or (C) certain of ECP’s patent rights, the Company will pay to Syscore the lesser of (x) one-half of the profits earned from such sale described in the foregoing item (ii), after accounting for the costs of acquiring and operating ECP, or (y) $15.0 million (less any previous milestone payment).
Payments to acquire businesses, cash paid	$ 15,750,000
Revenues		$ 0	$ 0
Net losses		3,700,000	$ 2,300,000
Pro forma adjustments, acquisitions		$ 0
ECP Entwicklungsgesellschaft mbH
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement		Jul. 01, 2014
Payments to acquire businesses, cash paid	13,000,000
Potential payouts payments	15,000,000
Expense due to infringement of certain patent rights acquired	7,000,000
Aggregate worldwide revenues, including revenues of third party licensees, targeted to be met for milestone payments	15,000,000
AIS GmbH Aachen Innovative Solutions
Business Acquisition [Line Items]
Payments to acquire businesses, cash paid	$ 2,800,000