Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended	12 Months Ended
	Jul. 01, 2014	Mar. 31, 2015	Mar. 31, 2015	Jul. 01, 2014
Business Acquisition [Line Items]
Payments to acquire businesses, cash paid	$ 15,750,000
Expense for the change in fair value contingent consideration			510,000
Selling, general and administrative
Business Acquisition [Line Items]
Legal, consulting and other costs related to the acquisition included in consolidated statements of operations		1,100,000
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			15,000,000
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 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 us 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 (y) 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 (z) $15.0 million (less any previous milestone payment).
Expense due to infringement of certain patent rights acquired	7,000,000			7,000,000
Aggregate worldwide revenues, including revenues of third party licensees, targeted to be met for milestone payments	125,000,000			125,000,000
Revenues		0
Net loss		2,300,000
Expense for the change in fair value contingent consideration		500,000
AIS GmbH Aachen Innovative Solutions
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement			Jun. 30, 2014
Payments to acquire businesses, cash paid	$ 2,800,000