Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 54,730	$ 55,429
General and administrative	(13,157)	(12,862)
Other income, net	646	896
Income before provision for income taxes	54,779	56,406
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	67,887	68,291
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(13,157)	(12,862)
Other income, net	646	896
Interest income (expense), net	$ (597)	$ 81