Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 63,758	$ 54,465	$ 100,748	$ 107,778
General and administrative	(15,299)	(14,178)	(31,383)	(27,854)
Other (expense) income, net	(578)		(451)
Income before income taxes	68,501		110,873
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	79,057		132,131
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(15,299)		(31,383)
Other (expense) income, net	5,321		10,576
Other (expense), net	$ (578)		$ (451)
Accounting Standards Update 2014-09 [Member]
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments		30,105		85,818
General and administrative		(19,618)		(34,655)
Other (expense) income, net		(238)		(854)
Income before income taxes		34,845		95,042
Accounting Standards Update 2014-09 [Member] | Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments		49,723		120,473
Accounting Standards Update 2014-09 [Member] | Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative		(19,618)		(34,655)
Other (expense) income, net		4,978		10,078
Other (expense), net		$ (238)		$ (854)