QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Condensed Financial Operating Results (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
Quarterly Financial Data [Abstract]
Revenue	$ 1,373,878	$ 1,264,958	$ 1,181,641	$ 1,165,864	$ 1,170,086	$ 1,124,100	$ 1,087,860		$ 1,085,814	$ 4,986,341	$ 4,467,860	$ 4,354,617
Income from operations	81,096	94,908	102,263	99,600	80,340	104,794	88,262		67,304	377,867	340,700	297,261
Net income	$ 50,030	$ 68,145	$ 68,596	$ 78,833	$ 51,831	$ 64,499	$ 142,795		$ 42,046	$ 265,604	$ 301,171	$ 163,671
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
Weighted-average basic shares outstanding	24,875	24,866	24,856	24,737	24,700	24,656	24,622		24,487	24,833	24,616	24,401
Weighted-average diluted shares outstanding	25,472	25,348	25,338	25,424	25,331	25,234	25,211		25,243	25,395	25,255	25,069

[1] Net income for the second quarter of FY2019 includes a net benefit related to the TCJA. See Note 19.