REVENUE RECOGNITION - Deferred Gift Card Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 24, 2020	Jun. 26, 2019	Jun. 27, 2018	Jun. 28, 2018	Jun. 28, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Beginning balance, Gift card liability		$ 100.9	$ 119.1
Gift card sales		6.3	(10.1)	$ (7.3)
Amount recognized to Franchise and other revenues		(1.7)	(2.8)
Ending balance, Gift card liability		109.9	100.9	119.1
Deferred income taxes, net		38.2	112.0
Cumulative effect of adoption of ASU		(479.1)	(778.2)	$ (718.3)		$ (493.6)
Gift card sales [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Gift card sales		164.4	180.3
Gift card redemptions [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Gift card redemptions recognized to Company sales		(139.2)	(169.4)
Other		(0.4)	(3.1)
Gift card breakage [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amount recognized to Franchise and other revenues	[1]	$ (15.8)	(26.0)
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred income taxes, net					$ 2.0
Cumulative effect of adoption of ASU					$ 6.2
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Gift card breakage [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Amount recognized to Franchise and other revenues	[1]		$ 8.2

[1] ⁽¹⁾  Gift card breakage in fiscal 2019 included the recognition of $8.2 million from the cumulative effect of adopting ASC 606, Revenue from Contracts with Customers due to the change in timing of recognition of breakage, with a corresponding $2.0 million decrease in Deferred income taxes, net, and a $6.2 million decrease in Shareholders’ deficit