EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 17,221	$ 16,775	$ 30,644	$ 27,446
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding - basic (in shares)	13,879	13,818	13,843	13,941
Effect of dilutive shares (in shares)	129	66	178	114
Weighted average shares common outstanding - diluted (in shares)	14,008	13,884	14,021	14,055
Earnings per common share - basic (in dollars per share)	$ 1.24	$ 1.21	$ 2.21	$ 1.97
Earnings per common share - diluted (in dollars per share)	$ 1.23	$ 1.21	$ 2.19	$ 1.95