Nature of Business and Basis of Preparation	9 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]
Nature of Business and Basis of Preparation	Note 1. Nature of Business and Basis of Preparation Abiomed, Inc. (the “Company”) is a provider of mechanical circulatory support devices and offers a continuum of care to heart failure patients. The Company develops, manufactures and markets proprietary products that are designed to enable the heart to rest, heal and recover by improving blood flow and/or performing the pumping function of the heart. The Company’s products are used in the cardiac catheterization lab, or cath lab, by interventional cardiologists and in the heart surgery suite by heart surgeons for patients who are in need of hemodynamic support prophylactically or emergently before, during or after angioplasty or heart surgery procedures. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial reporting and in accordance with Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete financial statements. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2015 that has been filed with the Securities and Exchange Commission (the “SEC”). In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, which are of a normal recurring nature and are necessary for a fair presentation of results for the interim periods presented. The results of operations for any interim period may not be indicative of results for the full fiscal year or any other subsequent period. There have been no changes in the Company’s significant accounting policies for the three and nine months ended December 31, 2015 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2015 that has been filed with the SEC. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers to provide updated guidance on revenue recognition. ASU 2014-09 requires a company to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies may need to use more judgment and make more estimates than under today’s guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 will become effective for the Company beginning in fiscal 2019 under either full or modified retrospective adoption, with early adoption permitted as of the original effective date of ASU 2014-09. The Company is currently evaluating the impact of adopting ASU 2014-09 on its net income, financial position, cash flows and disclosures. In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, which applies to inventory that is measured using first-in, first-out or average cost methods. Under the updated guidance, an entity should measure inventory that is within scope at the lower of cost and net realizable value, which is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. Subsequent measurement is unchanged for inventory that is measured using last-in, last-out. This ASU is effective for annual and interim periods beginning after December 15, 2016, and should be applied prospectively with early adoption permitted at the beginning of an interim or annual reporting period. The Company is currently evaluating the impact of adopting ASU 2015-11 on its condensed consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805)—Simplifying the Accounting for Measurement-Period Adjustments. The amendments in this update require that an acquirer recognizes adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this update require an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. For public business entities, the amendments in this update are effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. For all other entities, the amendments in this update are effective for fiscal years beginning after December 15, 2016, and interim periods within fiscal years beginning after December 15, 2017. The Company is in the process of assessing the impact of the adoption of ASU 2015-16 on its financial position. In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740)—Balance Sheet Classification of Deferred Taxes. This ASU requires an entity to classify deferred income tax assets and liabilities as noncurrent on the entity’s classified statement of financial position. This amendment eliminates the current requirement to classify deferred tax assets and liabilities as either current or noncurrent on the entity’s balance sheet. This amendment may be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. If applied prospectively, the entity should disclose in the first interim and first annual period of change, the nature of and the reason for the change in accounting principle and a statement that prior periods were not retrospectively adjusted. If applied retrospectively, the entity should disclose in the first interim and first annual period of change, the nature of and reason for the change in accounting principle and quantitative information about the effects of the accounting change on prior periods. This ASU is effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years. Earlier application is permitted as of the beginning of an interim or annual reporting period. The Company is in the process of assessing the impact of the adoption of ASU 2015-17 on its financial position. The FASB is currently working on amendments to existing accounting standards governing a number of areas including, but not limited to, accounting for leases. In May 2013, the FASB issued an ASU (Revised), Leases (Topic 842) (the “Exposure Draft”), which would replace the existing guidance in ASC 840— Leases (“ASC 840”). Under the Exposure Draft, among other changes in practice, a lessee’s rights and obligations under most leases, including existing and new arrangements, would be recognized as assets and liabilities, respectively, on the balance sheet. Other significant provisions of the Exposure Draft include (i) defining the “lease term” to include the noncancellable period together with periods for which there is a significant economic incentive for the lessee to extend or not terminate the lease; (ii) defining the initial lease liability to be recorded on the balance sheet to contemplate only those variable lease payments that depend on an index or that are in substance “fixed”; and (iii) a dual approach for determining whether lease expense is recognized on a straight-line or accelerated basis, depending on whether the lessee is expected to consume more than an insignificant portion of the leased asset’s economic benefits. In November 2015, the FASB announced the final lease standard will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years but the final standard has not yet been issued. This Exposure Draft will likely have an impact on the Company’s consolidated financial statements. The Company is currently evaluating the impact of adopting this proposed standard and has not yet determined the impact that this proposed change in accounting standards will have on its consolidated financial statements.

Note 1. Nature of Business and Basis of Preparation

Abiomed, Inc. (the “Company”) is a provider of mechanical circulatory support devices and offers a continuum of care to heart failure patients. The Company develops, manufactures and markets proprietary products that are designed to enable the heart to rest, heal and recover by improving blood flow and/or performing the pumping function of the heart. The Company’s products are used in the cardiac catheterization lab, or cath lab, by interventional cardiologists and in the heart surgery suite by heart surgeons for patients who are in need of hemodynamic support prophylactically or emergently before, during or after angioplasty or heart surgery procedures.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial reporting and in accordance with Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by GAAP for complete financial statements. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2015 that has been filed with the Securities and Exchange Commission (the “SEC”).

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, which are of a normal recurring nature and are necessary for a fair presentation of results for the interim periods presented. The results of operations for any interim period may not be indicative of results for the full fiscal year or any other subsequent period.

There have been no changes in the Company’s significant accounting policies for the three and nine months ended December 31, 2015 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2015 that has been filed with the SEC.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers to provide updated guidance on revenue recognition. ASU 2014-09 requires a company to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies may need to use more judgment and make more estimates than under today’s guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. ASU 2014-09 will become effective for the Company beginning in fiscal 2019 under either full or modified retrospective adoption, with early adoption permitted as of the original effective date of ASU 2014-09. The Company is currently evaluating the impact of adopting ASU 2014-09 on its net income, financial position, cash flows and disclosures.

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, which applies to inventory that is measured using first-in, first-out or average cost methods. Under the updated guidance, an entity should measure inventory that is within scope at the lower of cost and net realizable value, which is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. Subsequent measurement is unchanged for inventory that is measured using last-in, last-out. This ASU is effective for annual and interim periods beginning after December 15, 2016, and should be applied prospectively with early adoption permitted at the beginning of an interim or annual reporting period. The Company is currently evaluating the impact of adopting ASU 2015-11 on its condensed consolidated financial statements.

In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805)—Simplifying the Accounting for Measurement-Period Adjustments. The amendments in this update require that an acquirer recognizes adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this update require an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. For public business entities, the amendments in this update are effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. For all other entities, the amendments in this update are effective for fiscal years beginning after December 15, 2016, and interim periods within fiscal years beginning after December 15, 2017. The Company is in the process of assessing the impact of the adoption of ASU 2015-16 on its financial position.

In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740)—Balance Sheet Classification of Deferred Taxes. This ASU requires an entity to classify deferred income tax assets and liabilities as noncurrent on the entity’s classified statement of financial position. This amendment eliminates the current requirement to classify deferred tax assets and liabilities as either current or noncurrent on the entity’s balance sheet. This amendment may be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. If applied prospectively, the entity should disclose in the first interim and first annual period of change, the nature of and the reason for the change in accounting principle and a statement that prior periods were not retrospectively adjusted. If applied retrospectively, the entity should disclose in the first interim and first annual period of change, the nature of and reason for the change in accounting principle and quantitative information about the effects of the accounting change on prior periods. This ASU is effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years. Earlier application is permitted as of the beginning of an interim or annual reporting period. The Company is in the process of assessing the impact of the adoption of ASU 2015-17 on its financial position.

The FASB is currently working on amendments to existing accounting standards governing a number of areas including, but not limited to, accounting for leases. In May 2013, the FASB issued an ASU (Revised), Leases (Topic 842) (the “Exposure Draft”), which would replace the existing guidance in ASC 840— Leases (“ASC 840”). Under the Exposure Draft, among other changes in practice, a lessee’s rights and obligations under most leases, including existing and new arrangements, would be recognized as assets and liabilities, respectively, on the balance sheet. Other significant provisions of the Exposure Draft include (i) defining the “lease term” to include the noncancellable period together with periods for which there is a significant economic incentive for the lessee to extend or not terminate the lease; (ii) defining the initial lease liability to be recorded on the balance sheet to contemplate only those variable lease payments that depend on an index or that are in substance “fixed”; and (iii) a dual approach for determining whether lease expense is recognized on a straight-line or accelerated basis, depending on whether the lessee is expected to consume more than an insignificant portion of the leased asset’s economic benefits. In November 2015, the FASB announced the final lease standard will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years but the final standard has not yet been issued. This Exposure Draft will likely have an impact on the Company’s consolidated financial statements. The Company is currently evaluating the impact of adopting this proposed standard and has not yet determined the impact that this proposed change in accounting standards will have on its consolidated financial statements.