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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									12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 50,030	$ 68,145	$ 68,596	$ 78,833	$ 51,831	$ 64,499	$ 142,795		$ 42,046	$ 265,604	$ 301,171	$ 163,671
Weighted-average number of basic shares outstanding during the period	24,875	24,866	24,856	24,737	24,700	24,656	24,622		24,487	24,833	24,616	24,401
Dilutive effect of RSUs after application of treasury stock method										562	639	668
Weighted-average number of diluted shares outstanding during the period	25,472	25,348	25,338	25,424	25,331	25,234	25,211		25,243	25,395	25,255	25,069
Basic earnings per share	$ 2.01	$ 2.74	$ 2.76	$ 3.19	$ 2.10	$ 2.62	$ 5.80		$ 1.72	$ 10.70	$ 12.23	$ 6.71
Diluted earnings per share	$ 1.96	$ 2.69	$ 2.71	$ 3.10	$ 2.05	$ 2.56	$ 5.66		$ 1.67	$ 10.46	$ 11.93	$ 6.53
[1] Net income for the second quarter of FY2019 includes a net benefit related to the TCJA. See Note 19.

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