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STOCK-BASED COMPENSATION: Non vested time vesting restricted stock unit activity (Details) - Restricted stock units - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Restricted Stock Unit Activity - Other disclosures |  |  |
Share-based compensation expense | $ 25.4 | $ 17.5 |
Future share-based compensation expense expected | $ 137.3 |  |
Performance stock |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 394,188 |  |
Granted (in shares) | 202,818 |  |
Forfeited or cancelled (in shares) | (46,236) |  |
Outstanding at the end of the period (in shares) | 550,770 |  | 394,188
Non-vested restricted stock units, Weighted average fair value per share at grant date |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 43.88 |  |
Granted (in dollars per share) | 60.65 |  |
Forfeited or cancelled (in dollars per share) | 34.61 |  |
Outstanding at the end of the period (in dollars per share) | $ 50.83 |  | $ 43.88
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 2 years 8 months 23 days |  | 3 years 2 months 23 days
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 12.3 |  |
Time Based Vesting |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 3,054,750 |  |
Granted (in shares) | 1,273,119 |  |
Vested (in shares) | (237,220) |  |
Forfeited or cancelled (in shares) | (220,733) |  |
Outstanding at the end of the period (in shares) | 3,869,916 |  | 3,054,750
Non-vested restricted stock units, Weighted average fair value per share at grant date |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 30.91 |  |
Granted (in dollars per share) | 53.06 |  |
Vested (in dollars per share) | 24.61 |  |
Forfeited or cancelled (in dollars per share) | 36.19 |  |
Outstanding at the end of the period (in dollars per share) | $ 38.28 |  | $ 30.91
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 2 years 6 months 18 days |  | 2 years 5 months 19 days
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 67.5 |  |
Total fair value | $ 12.0 |  |
Time Based Vesting | Data Plus Math Corporation |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 155,346 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 7.3 |  |
Performance Shares Vesting Total Shareholder Return |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 60,844 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 4.4 |  |
Performance Shares Vesting Under The Second Plan |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 141,974 |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 7.9 |  |
Vesting in four years |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting period | 4 years |  |
Minimum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 0.00% |  |
Minimum | Performance Shares Vesting Under The Second Plan |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 0.00% |  |
Maximum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 200.00% |  |
Maximum | Performance Shares Vesting Under The Second Plan |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 200.00% |  |

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