Business Segment Information - Summarized Financial Information of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue from external customers	$ 1,087,860	$ 1,057,530	$ 2,173,674	$ 2,130,810
Net income	142,795	42,420	184,841	79,083
Domestic Operations
Segment Reporting Information [Line Items]
Revenue from external customers	1,046,823	1,024,025	2,097,706	2,062,916
Net income	138,930	38,732	177,763	72,374
International Operations
Segment Reporting Information [Line Items]
Revenue from external customers	41,037	33,505	75,968	67,894
Net income	$ 3,865	$ 3,688	$ 7,078	$ 6,709