Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net earnings	$ 14,938	$ 14,508	$ 51,143	$ 48,906
Weighted average shares	61,369	61,082	61,252	61,319
Basic earnings per common share:	$ 0.24	$ 0.24	$ 0.83	$ 0.80
Dilutive effect of common stock equivalents	1,684	1,431	1,566	1,286
Diluted weighted average common shares	63,053	62,513	62,818	62,605
Diluted earnings per common share:	$ 0.24	$ 0.23	$ 0.81	$ 0.78