Subsequent Event	6 Months Ended
Sep. 30, 2012
Subsequent Event	Note 11. Subsequent Event On October 26, 2012, the Company was informed that the United States Attorney’s Office for the District of Columbia is conducting an investigation that is focused on the Company’s marketing and labeling of the Impella 2.5. On October 31, 2012, the Company accepted service of a Health Insurance Portability and Accounting Act administrative subpoena related to this investigation. The subpoena seeks documents related to the Impella 2.5 and the Company understands the investigation focuses primarily on marketing and labeling issues. The Company is in the process of responding to the subpoena and intends to cooperate fully.

Subsequent Event

6 Months Ended

Sep. 30, 2012

Note 11. Subsequent Event

On October 26, 2012, the Company was informed that the United States Attorney’s Office for the District of Columbia is conducting an investigation that is focused on the Company’s marketing and labeling of the Impella 2.5. On October 31, 2012, the Company accepted service of a Health Insurance Portability and Accounting Act administrative subpoena related to this investigation. The subpoena seeks documents related to the Impella 2.5 and the Company understands the investigation focuses primarily on marketing and labeling issues. The Company is in the process of responding to the subpoena and intends to cooperate fully.