Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 52,273	$ 50,681	$ 163,069	$ 162,409
General and administrative	(12,120)	(15,606)	(37,140)	(42,273)
Other income (expense), net	(56)	(2,686)	1,287	(1,947)
Income before provision for income taxes	51,434	47,755	162,300	160,361
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	64,393	66,287	200,209	204,682
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(12,120)	(15,606)	(37,140)	(42,273)
Other income (expense), net	(56)	(2,686)	1,287	(1,947)
Interest (expense) income, net	$ (783)	$ (240)	$ (2,056)	$ (101)