Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal tax expense at statutory federal rate	$ 54,408	$ 56,468	$ 76,470
State and local income taxes, net of federal benefit	21,312	23,910	21,372
Change in estimated applicable corporate tax rate used to determine deferred taxes	(1,899)	1,398	(497)
Impact of Tax Act on deferred taxes	0	0	(106,446)
Domestic production activities tax deduction	0	0	(3,585)
Tax Benefit Relating to Uncertain Tax Positions	0	0	(14)
Tax return to GAAP provision adjustments	(420)	(1,770)	(3,411)
Impact of nondeductible officers' compensation	2,046	2,989	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount	(1,576)	(515)	(312)
Nondeductible expenses and other	(8)	235	85
Income tax (benefit) expense	$ 73,863	$ 82,715	$ (16,338)