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SHARE-BASED COMPENSATION: Performance Stock Option Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercised (in dollars per share) |  | $ 9.59 |  |
Number of shares |  |  |  |
Outstanding at beginning of the period (in shares) |  | 2,456,184 |  |
Forfeited or cancelled (in shares) |  | (18,646) |  |
Outstanding at end of the period (in shares) | 2,456,184 | 2,164,529 |  | 2,456,184
Exercisable at the end of the period (in shares) |  | 1,951,500 |  |
Weighted-average exercise price per share |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 13.30 |  |
Forfeited or cancelled (in dollars per share) |  | 19.07 |  |
Outstanding at the end of the period (in dollars per share) | $ 13.30 | 13.72 |  | $ 13.30
Exercisable at the end of the period (in dollars per share) |  | $ 14.43 |  |
Weighted-average remaining contractual term |  |  |  |
Weighted average remaining contractual term |  | 4 years 10 months 24 days |  |
Exercisable at the end of the period |  | 4 years 8 months 12 days |  |
Aggregate intrinsic value |  |  |  |
Outstanding at the end of the period |  | $ 75,248 |  |
Exercisable at the end of the period |  | 66,462 |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 17,500 | $ 14,900 |
Performance stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Future expense for performance stock option units |  | $ 800 |  |
Period for recognition of unrecognized stock-based compensation expense |  | 3 years |  |
Number of shares |  |  |  |
Outstanding at beginning of the period (in shares) |  | 322,823 |  |
Forfeited or cancelled (in shares) |  | (186,090) |  |
Outstanding at end of the period (in shares) | 322,823 | 136,733 |  | 322,823
Exercisable at the end of the period (in shares) |  | 0 |  |
Weighted-average exercise price per share |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 21.42 |  |
Forfeited or cancelled (in dollars per share) |  | 21.41 |  |
Outstanding at the end of the period (in dollars per share) | $ 21.42 | 21.44 |  | $ 21.42
Exercisable at the end of the period (in dollars per share) |  | $ 0 |  |
Weighted-average remaining contractual term |  |  |  |
Weighted average remaining contractual term |  | 1 year 7 months 6 days |  |
Exercisable at the end of the period |  | 0 years |  |
Aggregate intrinsic value |  |  |  |
Outstanding at the end of the period |  | $ 3,698 |  |
Exercisable at the end of the period |  | $ 0 |  |
Performance stock | Shares Vesting Based On Relevant Performance Period At March 31 2018 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of units reached maturity | 161,412 |  |  |
Vesting percentage |  |  |  | 0.00%

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