SHARE-BASED COMPENSATION: Performance Stock Option Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised (in dollars per share)	$ 8.80
Number of shares
Outstanding at beginning of the period (in shares)	2,565,287
Forfeited or cancelled (in shares)	(25,831)
Outstanding at end of the period (in shares)	2,414,019		2,565,287
Exercisable at the end of the period (in shares)	2,169,170
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 13.61
Forfeited or cancelled (in dollars per share)	14.25
Outstanding at the end of the period (in dollars per share)	13.86		$ 13.61
Exercisable at the end of the period (in dollars per share)	$ 14.58
Weighted-average remaining contractual term
Weighted average remaining contractual term	5 years 1 month 6 days
Exercisable at the end of the period	4 years 9 months 18 days
Aggregate intrinsic value
Outstanding at the end of the period	$ 38,910
Exercisable at the end of the period	33,397
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	10,900	$ 8,800
Performance stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	300	$ 500
Future expense for performance stock option units	$ 1,100
Period for recognition of unrecognized stock-based compensation expense	3 years
Number of shares
Outstanding at beginning of the period (in shares)	329,404
Forfeited or cancelled (in shares)	(186,538)
Outstanding at end of the period (in shares)	142,866		329,404
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)	21.43		$ 21.42
Exercisable at the end of the period (in dollars per share)	$ 0.00
Weighted-average remaining contractual term
Weighted average remaining contractual term	1 year 10 months 21 days
Exercisable at the end of the period	0 years
Aggregate intrinsic value
Outstanding at the end of the period	$ 1,217
Exercisable at the end of the period	$ 0
Performance stock | Shares Vesting Based On Relevant Performance Period At March 31 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units reached maturity			164,702
Vesting percentage			0.00%