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Stock-based Compensation Restricted Stock Unit Activity (Details)
 6 Months Ended
Sep. 30, 2016
$ / shares
shares
Mar. 31, 2016
Stock-based Compensation Restricted Stock Unit Activity Details    
Balance at beginning of period | shares 4,544,799  
Granted | shares 1,899,350  
Vested | shares (868,648)  
Forfeited | shares (141,143)  
Balance at end of period | shares 5,434,358  
RSU weighted-average remaining contractual term, in years 1.75 1.67
Beginning of period, weighted-average grant date fair value | $ / shares $ 8.08  
Granted, weighted-average grant date fair value | $ / shares 15.08  
Vested, weighted-average grant date fair value | $ / shares 8.27  
Forfeited, weighted-average grant date fair value | $ / shares 8.82  
End of period, weighted-average grant date fair value | $ / shares $ 10.49