Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 51,157	$ 52,273	$ 158,935	$ 163,069
General and administrative	(14,430)	(12,120)	(42,284)	(37,140)
Other (expense) income, net	(104)	(56)	(958)	1,287
Income before provision for income taxes	49,591	51,434	154,229	162,300
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	65,587	64,393	201,219	200,209
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(14,430)	(12,120)	(42,284)	(37,140)
Other (expense) income, net	(104)	(56)	(958)	1,287
Interest (expense), net	$ (1,462)	$ (783)	$ (3,748)	$ (2,056)