Business Segment Information - Summarized Financial Information of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue from external customers	$ 1,124,100	$ 1,086,418	$ 3,297,774	$ 3,217,228
Net income	64,499	40,357	249,340	119,440
Domestic Operations
Segment Reporting Information [Line Items]
Revenue from external customers	1,079,953	1,051,449	3,177,659	3,114,365
Net income	60,779	36,920	238,542	109,294
International Operations
Segment Reporting Information [Line Items]
Revenue from external customers	44,147	34,969	120,115	102,863
Net income	$ 3,720	$ 3,437	$ 10,798	$ 10,146