Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net earnings	$ 26,149	$ 21,141
Weighted average shares	63,420	62,744
Basic earnings per common share	$ 0.41	$ 0.34
Net earnings	$ 26,149	$ 21,141
Weighted average shares	63,420	62,744
Dilutive effect of common stock equivalents	2,738	2,539
Diluted weighted average common shares	66,158	65,283
Diluted earnings per common share	$ 0.40	$ 0.32