Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net earnings	$ 23,903	$ 18,991	$ 40,197	$ 36,205
Weighted average shares	62,390	61,165	62,205	61,194
Basic earnings per common share	$ 0.38	$ 0.31	$ 0.65	$ 0.59
Net earnings	$ 23,903	$ 18,991	$ 40,197	$ 36,205
Weighted average shares	62,390	61,165	62,205	61,194
Dilutive effect of common stock equivalents	2,017	1,508	1,794	1,507
Diluted weighted average common shares	64,407	62,673	63,999	62,701
Diluted earnings per common share	$ 0.37	$ 0.30	$ 0.63	$ 0.58