EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 18,003	$ 17,221	$ 33,276	$ 30,644
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding - basic (in shares)	13,494	13,879	13,464	13,843
Effect of dilutive shares (in shares)	92	129	133	178
Weighted average shares common outstanding - diluted (in shares)	13,586	14,008	13,597	14,021
Earnings per common share - basic (in dollars per share)	$ 1.33	$ 1.24	$ 2.47	$ 2.21
Earnings per common share - diluted (in dollars per share)	$ 1.33	$ 1.23	$ 2.45	$ 2.19