STOCKHOLDERS'EQUITY: - Performance Stock Option Unit Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2017 USD ($) item $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of increment over two years	3.33333%
Performance stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares granted | $	$ 4,900
Number of separate increments over 2 years | item	2
Percentage of increment over two years	50.00%
Number of years for 50% increments	2 years
Share-based compensation expense | $	$ 1,300
Future expense for performance stock option units | $	$ 3,900
Period for recognition of unrecognized stock-based compensation expense	4 years
Number of shares
Granted (in shares)	633,604
Forfeited or cancelled (in shares)	(78,481)
Outstanding at end of the period (in shares)	555,123
Weighted-average exercise price per share
Granted (in dollars per share) | $ / shares	$ 21.40
Forfeited or cancelled (in dollars per share) | $ / shares	21.36
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 21.41
Weighted-average remaining contractual term
Outstanding at the end of the period	2 years 1 month 6 days
Aggregate intrinsic value
Outstanding at the end of the period | $	$ 3,921
Performance stock | Vesting on first anniversary on closing date | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Performance stock | Vesting on first anniversary on closing date | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	300.00%
Performance stock | Vesting based on relevant performance period at March 31 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	171.00%
Number of units reached maturity	185,042
Options issued (in shares)	316,422