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Stockholders' Equity Restricted Stock Unit Activity (Details) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 $ / shares shares | Mar. 31, 2017 $ / shares shares | Mar. 31, 2016 $ / shares shares | Mar. 31, 2015
Stockholders Equity Restricted Stock Unit Activity Details |  |  |  |
Balance at beginning of period | shares | 4,939,050 | 4,544,799 | 2,698,686 |
Granted | shares | 3,481,870 | 2,491,877 | 2,681,997 |
Vested | shares | (1,833,038) | (1,600,831) | (589,788) |
Forfeited | shares | (652,339) | (496,795) | (246,096) |
Balance at end of period | shares | 5,935,543 | 4,939,050 | 4,544,799 |
RSU weighted-average remaining contractual term, in years | 1.60 | 1.55 | 1.67 | 1.88
Beginning of period, weighted-average purchase price | $ / shares | $ 11.57 | $ 8.08 | $ 7.33 |
Granted, weighted-average purchase price | $ / shares | 14.41 | 15.15 | 8.78 |
Vested, weighted-average purchase price | $ / shares | 10.27 | 7.89 | 7.79 |
Forfeited, weighted-average purchase price | $ / shares | 12.73 | 9.56 | 8.15 |
End of period, weighted-average purchase price | $ / shares | $ 13.51 | $ 11.57 | $ 8.08 |

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