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Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net earnings	$ 28,702	$ 9,596	$ 54,851	$ 30,737
Weighted average shares	63,588	62,302	63,504	62,523
Basic earnings per common share	$ 0.45	$ 0.15	$ 0.86	$ 0.49
Net earnings	$ 28,702	$ 9,596	$ 54,851	$ 30,737
Weighted average shares	63,588	62,302	63,504	62,523
Dilutive effect of common stock equivalents	2,085	2,736	2,412	2,638
Diluted weighted average common shares	65,673	65,038	65,916	65,161
Diluted earnings per common share	$ 0.44	$ 0.15	$ 0.83	$ 0.47

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