STOCK PLANS AND STOCK-BASED COMPENSATION Stock Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, March 31, 2017 (shares)	627,321
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, March 31, 2016 (shares)	923,000
Options granted (shares)	0
Options exercised (shares)	(277,000)
Options forfeited or expired (shares)	(18,000)
Options outstanding, March 31, 2017 (shares)	627,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price of options outstanding at March 31, 2016 (in dollars per share) | $ / shares	$ 47.53
Weighted average exercise price of options granted (in dollars per share) | $ / shares	0.00
Weighted average exercise price of options exercised (in dollars per share) | $ / shares	45.07
Weighted average exercise price of options forfeited or expired (in dollars per share) | $ / shares	46.06
Weighted average exercise price of options outstanding at March 31, 2017 (in dollars per share) | $ / shares	$ 48.66
Weighted average remaining contractual life of options outstanding at March 31, 2016 (in years)	2 years 128 days
Aggregate intrinsic value of options outstanding at March 31, 2017 | $	$ 670
Vested or expected to vest at March 31, 2017 (in shares)	627,000
Weighted average exercise price of options vested or expected to vest at March 31, 2017 (in dollars per share) | $ / shares	$ 48.66
Weighted average remaining contractual life of options vested or expected to vest at March 31, 2017 (in years)	2 years 128 days
Aggregate intrinsic value of options vested or expected to vest at March 31, 2017 | $	$ 670
Exercisable at March 31, 2017 (in shares)	594,000
Weighted average exercise price of options exercisable at March 31, 2017 (in dollars per share) | $ / shares	$ 48.80
Weighted average remaining contractual life of options exercisable at March 31, 2017 (in years)	2 years 73 days
Aggregate intrinsic value of options exercisable at March 31, 2017 | $	$ 640