EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 16,775	$ 15,679	$ 27,446	$ 24,493
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding-basic (in shares)	6,909	7,274	6,971	7,249
Effect of dilutive shares (in shares)	33	23	56	61
Weighted average shares common outstanding-diluted (in shares)	6,942	7,297	7,027	7,310
Earnings per common share - basic (in dollars per share)	$ 2.43	$ 2.16	$ 3.94	$ 3.38
Earnings per common share - diluted (in dollars per share)	$ 2.42	$ 2.15	$ 3.91	$ 3.35