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SHARE-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, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Restricted Stock Unit Activity - Other disclosures |  |  |
Share-based compensation expense | $ 17.5 | $ 14.9 |
Time Based Vesting |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 2,702,497 |  |
Granted (in shares) | 1,383,409 |  |
Vested (in shares) | (745,573) |  |
Forfeited or cancelled (in shares) | (200,222) |  |
Outstanding at the end of the period (in shares) | 3,140,111 |  | 2,702,497
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) | $ 24.60 |  |
Granted (in dollars per share) | 29.15 |  |
Vested (in dollars per share) | 23.94 |  |
Forfeited or cancelled (in dollars per share) | 25.18 |  |
Outstanding at the end of the period (in dollars per share) | $ 26.73 |  | $ 24.60
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 2 years 8 months 15 days |  | 2 years 4 months 2 days
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 40.3 |  |
Performance stock |  |  |
Non-vested restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | 561,018 |  |
Granted (in shares) | 186,539 |  |
Forfeited or cancelled (in shares) | (110,536) |  |
Outstanding at the end of the period (in shares) | 637,021 |  | 561,018
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) | $ 25.58 |  |
Granted (in dollars per share) | 31.07 |  |
Forfeited or cancelled (in dollars per share) | 25.08 |  |
Outstanding at the end of the period (in dollars per share) | $ 27.28 |  | $ 25.58
Weighted-average remaining contractual term |  |  |
Weighted average remaining contractual term (in years) | 1 year 6 months 21 days |  | 1 year 8 months 1 day
Restricted Stock Unit Activity - Other disclosures |  |  |
Aggregate fair value of restricted stock units granted | $ 5.8 |  |
Performance Shares Vesting Total Shareholder Return |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 186,539 |  |
Share-based Compensation Award, Tranche One |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | $ 20.5 |  |
Share-based Compensation Award, Tranche Two |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 29.2 |  |
Share-based Compensation Award, Tranche Three |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 19.8 |  |
Share-based Compensation Award, Tranche Four |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | 10.5 |  |
Share-based Compensation Award, Tranche Five |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Future share-based compensation expense expected | $ 1.4 |  |
Vesting in four years |  |  |
Share-based compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 197,115 |  |
Partial cliff vest tranche one |  |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 1,172,263 |  |
Partial cliff vesting tranche two |  |  |
Share-based compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Vesting in one year |  |  |
Share-based compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |
Non-vested restricted stock unit activity |  |  |
Granted (in shares) | 14,031 |  |
Minimum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 25.00% |  |
Maximum | Performance Shares Vesting Total Shareholder Return |  |  |
Restricted Stock Unit Activity - Other disclosures |  |  |
Vesting percentage | 200.00% |  |

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