Nature of Business and Basis of Preparation	9 Months Ended
Dec. 31, 2012
Nature of Business and Basis of Preparation	Note 1. Nature of Business and Basis of Preparation Abiomed, Inc. (the “Company” or “Abiomed”) is a leading provider of mechanical circulatory support devices and offers a continuum of care in heart recovery 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 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, 2012 that has been filed with the Securities and Exchange Commission, or SEC. In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments, which are of a normal recurring nature, 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. There have been no changes in the Company’s significant accounting policies for the three and nine months ended December 31, 2012 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, 2012 that has been filed with the SEC. Recently Adopted Accounting Standards During the first quarter of fiscal 2013, the Company adopted Accounting Standards Update, or ASU, No ASU 2011-05, Presentation of Comprehensive Income. ASU 2011-05 requires entities to present net income and other comprehensive income in either a single continuous statement of comprehensive income or in two separate, but consecutive, statements of net income and other comprehensive income. In December 2011, the Financial Accounting Standards Board, or FASB, issued ASU No. 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05. ASU 2011-12 amended ASU 2011-05 by indefinitely deferring the requirement to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. The Company has adopted ASU 2011-05 with retrospective application as required and has included separate unaudited statements of comprehensive income in these condensed consolidated financial statements. The adoption of this standard did not impact the Company’s condensed consolidated financial statements other than this change in presentation. During the first quarter of fiscal 2013, the Company adopted ASU No. 2011-08, Testing for Goodwill Impairment. ASU 2011-08 amended current goodwill impairment testing guidance by providing entities with an option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The adoption of this standard did not impact the Company’s condensed consolidated financial statements.

Note 1. Nature of Business and Basis of Preparation

Abiomed, Inc. (the “Company” or “Abiomed”) is a leading provider of mechanical circulatory support devices and offers a continuum of care in heart recovery 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 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, 2012 that has been filed with the Securities and Exchange Commission, or SEC.

In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments, which are of a normal recurring nature, 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.

There have been no changes in the Company’s significant accounting policies for the three and nine months ended December 31, 2012 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, 2012 that has been filed with the SEC.

Recently Adopted Accounting Standards

During the first quarter of fiscal 2013, the Company adopted Accounting Standards Update, or ASU, No ASU 2011-05, Presentation of Comprehensive Income. ASU 2011-05 requires entities to present net income and other comprehensive income in either a single continuous statement of comprehensive income or in two separate, but consecutive, statements of net income and other comprehensive income. In December 2011, the Financial Accounting Standards Board, or FASB, issued ASU No. 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05. ASU 2011-12 amended ASU 2011-05 by indefinitely deferring the requirement to present reclassification adjustments out of accumulated other comprehensive income by component in both the statement in which net income is presented and the statement in which other comprehensive income is presented. The Company has adopted ASU 2011-05 with retrospective application as required and has included separate unaudited statements of comprehensive income in these condensed consolidated financial statements. The adoption of this standard did not impact the Company’s condensed consolidated financial statements other than this change in presentation.

During the first quarter of fiscal 2013, the Company adopted ASU No. 2011-08, Testing for Goodwill Impairment. ASU 2011-08 amended current goodwill impairment testing guidance by providing entities with an option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The adoption of this standard did not impact the Company’s condensed consolidated financial statements.