Stockholders' Equity - Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan [Member], 2012 Employee Stock Purchase Plan) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Aug. 31, 2014	Aug. 30, 2012
Employee Stock Purchase Plan [Member] | 2012 Employee Stock Purchase Plan
Class of Stock [Line Items]
Common stock reserved for issuance				1.8
Additional shares reserved for issuance			2.0
Percentage of purchase price of common stock equal to fair market value	85.00%
Common stock, shares issued, employee stock purchase plan	0.2	0.3
Shares available for future issuance	2.3