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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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 68,596	$ 142,795	$ 147,429	$ 184,841
Weighted-average number of basic shares outstanding during the period	24,856	24,622	24,796	24,555
Dilutive effect of RSUs after application of treasury stock method	482	589	585	673
Weighted-average number of diluted shares outstanding during the period	25,338	25,211	25,381	25,228
Basic earnings per share	$ 2.76	$ 5.80	$ 5.95	$ 7.53
Diluted earnings per share	$ 2.71	$ 5.66	$ 5.81	$ 7.33

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