INCOME TAXES (Reconciliation Between Reported Provision For Income Taxes And Amount Computed By Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 24, 2020	Jun. 26, 2019	Jun. 27, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate	$ 1.0	$ 36.1	$ 47.8
FICA tax credit	(24.8)	(28.2)	(22.6)
State income taxes, net of Federal benefit	3.6	8.5	8.7
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	0.0	0.0	8.2
Stock based compensation tax shortfall	0.5	0.5	1.1
Other	0.2	0.0	1.1
Provision (benefit) for income taxes	$ (19.5)	$ 16.9	$ 44.3
Statutory Federal income tax rate	21.00%	21.00%	28.10%