Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 47,304	$ 36,990
General and administrative	(19,884)	(16,084)
Interest income, net	1,132	128
Income before income taxes	53,412	42,373
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	67,188	53,074
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(19,884)	(16,084)
Interest income, net	4,976	5,255
Other income, net	$ 1,132	$ 128