Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 70,831	$ 51,157	$ 171,579	$ 158,935
General and administrative	(14,863)	(14,430)	(46,246)	(42,284)
Interest income, net	(34)		(485)
Income before income taxes	75,282		186,155
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	85,694		217,825
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(14,863)		(46,246)
Interest income, net	4,485		15,061
Other (expense), net	$ (34)		$ (485)
Accounting Standards Update 2014-09 [Member]
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments		53,619		139,437
General and administrative		(14,533)		(49,188)
Interest income, net		(104)		(958)
Income before income taxes		58,334		153,376
Accounting Standards Update 2014-09 [Member] | Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments		68,152		188,625
Accounting Standards Update 2014-09 [Member] | Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative		(14,533)		(49,188)
Interest income, net		4,819		14,897
Other (expense), net		$ (104)		$ (958)