INCOME TAXES (Reconciliation Between Reported and Computed by Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 23, 2020	Dec. 25, 2019	Dec. 23, 2020	Dec. 25, 2019
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate			$ 3.9
FICA tip tax credit			(6.8)
Stock-based compensation tax windfall			(1.2)
State income taxes, net of federal benefit			1.3
Other			(1.5)
Provision (benefit) for income taxes	$ (3.8)	$ 1.1	$ (4.3)	$ 3.0