Stock-based Compensation Restricted Stock Unit Activity (Details)	6 Months Ended
	Sep. 30, 2015 $ / shares shares	Mar. 31, 2015
Stock-based Compensation Restricted Stock Unit Activity Details
Balance at beginning of period | shares	2,698,686
Granted | shares	2,288,642
Vested | shares	(166,692)
Forfeited | shares	(79,757)
Balance at end of period | shares	4,740,879
RSU weighted-average remaining contractual term, in years	1.89	1.88
Beginning of period, weighted-average purchase price	$ 7.33
Granted, weighted-average purchase price	8.57
Vested, weighted-average purchase price	8.86
Forfeited, weighted-average purchase price	8.18
End of period, weighted-average purchase price	$ 7.86