Segment Information - Reconciliation of Total Segment Profit to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	$ 68,899	$ 44,734	$ 252,522	$ 141,063
General and administrative	(21,553)	(18,219)	(60,389)	(54,525)
Interest income	8,410	8,173	26,383	24,577
Interest (expense)	1,495	3,207	5,639	9,368
Other (expense), net	(5)	(352)	(1,807)	(217)
Income before income taxes	75,809	49,348	271,459	156,055
Operating segments
Reconciliation to Income before Income Taxes
Total segment profit for reportable segments	90,452	62,953	312,911	195,588
Segment Reconciling Items
Reconciliation to Income before Income Taxes
General and administrative	(21,553)	(18,219)	(60,389)	(54,525)
Interest income	8,410	8,173	26,383	24,577
Interest (expense)	(1,495)	(3,207)	(5,639)	(9,368)
Other (expense), net	$ (5)	$ (352)	$ (1,807)	$ (217)