STOCK-BASED COMPENSATION: Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Stock Option Activity - Number of Shares
Outstanding at beginning of the period (in shares) | shares	1,350,658
Exercised (in shares) | shares	(524,085)
Forfeited or cancelled (in shares) | shares	(6,124)
Outstanding at end of the period (in shares) | shares	820,449
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 14.43
Exercised (in dollars per share) | $ / shares	12.37
Forfeited or cancelled (in dollars per share) | $ / shares	5.24
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 15.81
Weighted average remaining contractual term	3 years 4 months 24 days
Exercised | $	$ 22,271
Outstanding at the end of the period | $	$ 47,075
Exercisable at the end of the period (in shares) | shares	783,303
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 16.47
Exercisable at the end of the period	3 years 2 months 12 days
Exercisable at the end of the period | $	$ 44,431