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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		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 79,195	$ 68,596	$ 147,172	$ 147,429
Weighted-average number of basic shares outstanding during the period	25,065	24,856	24,979	24,796
Dilutive effect of RSUs after application of treasury stock method	370	482	504	585
Weighted-average number of diluted shares outstanding during the period	25,435	25,338	25,483	25,381
Basic earnings per share	$ 3.16	$ 2.76	$ 5.89	$ 5.95
Diluted earnings per share	$ 3.11	$ 2.71	$ 5.78	$ 5.81

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