Income Taxes (Reconciliation Of The Effective Income Tax Rate) (Details)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Statutory rate	28.10%	35.00%	35.00%
State and local income taxes	3.00%	2.40%	2.30%
One-time benefit on re-measurement of net deferred tax liability	(5.50%)	0.00%	0.00%
Domestic manufacturing deduction for qualified income	(2.30%)	(2.80%)	(3.00%)
Net windfall tax benefits - stock-based compensation	(0.40%)	(0.00%)	(0.00%)
ESOP dividend deduction	(0.10%)	(0.10%)	(0.40%)
Other	(0.50%)	(0.20%)	0.20%
Effective rate	22.30%	34.30%	34.10%