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Earnings Per Share - Calculation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 67,977	$ 78,833
Weighted-average number of basic shares outstanding during the period	24,894	24,737
Dilutive effect of RSUs after application of treasury stock method	638	687
Weighted-average number of diluted shares outstanding during the period	25,532	25,424
Basic earnings per share	$ 2.73	$ 3.19
Diluted earnings per share	$ 2.66	$ 3.10

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