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STOCK-BASED COMPENSATION: Performance Stock Option Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Exercised (in dollars per share) | $ 11.22 |
Number of shares |  |
Outstanding at beginning of the period (in shares) | 2,456,184 |
Forfeited or cancelled (in shares) | (25,591) |
Outstanding at end of the period (in shares) | 1,560,140 |
Exercisable at the end of the period (in shares) | 1,378,721 |
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) | 18.64 |
Outstanding at the end of the period (in dollars per share) | 14.37 |
Exercisable at the end of the period (in dollars per share) | $ 15.27 |
Weighted-average remaining contractual term |  |
Weighted average remaining contractual term | 4 years 9 months 18 days |
Exercisable at the end of the period | 4 years 6 months |
Aggregate intrinsic value |  |
Outstanding at the end of the period | $ 37,850 |
Exercisable at the end of the period | 32,210 |
Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 34,600 | $ 21,600
Performance stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 200 | $ 900
Future expense for performance stock option units | $ 600 |
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) | (187,885) |
Outstanding at end of the period (in shares) | 134,938 |
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) | 21.44 |
Exercisable at the end of the period (in dollars per share) | $ 0 |
Weighted-average remaining contractual term |  |
Weighted average remaining contractual term | 1 year 4 months 24 days |
Exercisable at the end of the period | 0 years |
Aggregate intrinsic value |  |
Outstanding at the end of the period | $ 2,320 |
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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