SHAREHOLDERS' DEFICIT (Changes in Shareholders' Deficit) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 23, 2020	Sep. 25, 2019
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	$ (479.1)	$ (778.2)
Net income	10.7	14.9
Other comprehensive income (loss)	0.3	(0.2)
Dividends	0.0	(14.6)
Stock-based compensation	3.9	7.1
Purchases of treasury stock	(3.9)	(11.3)
Issuances of common stock	3.0	1.3
Ending balance	(465.1)	(585.1)
Cumulative Effect, Period of Adoption, Adjustment | ASC 842 Leases [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance		195.9
Common Stock [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	7.0	17.6
Net income	0.0	0.0
Other comprehensive income (loss)	0.0	0.0
Dividends	0.0	0.0
Stock-based compensation	0.0	0.0
Purchases of treasury stock	0.0	0.0
Issuances of common stock	0.0	0.0
Ending balance	7.0	17.6
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	669.4	522.0
Net income	0.0	0.0
Other comprehensive income (loss)	0.0	0.0
Dividends	0.0	0.0
Stock-based compensation	3.9	7.1
Purchases of treasury stock	(1.1)	(0.3)
Issuances of common stock	(9.0)	(3.7)
Ending balance	663.2	525.1
(Accumulated Deficit) Retained Earnings [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(397.5)	2,771.2
Net income	10.7	14.9
Other comprehensive income (loss)	0.0	0.0
Dividends	0.0	(14.6)
Stock-based compensation	0.0	0.0
Purchases of treasury stock	0.0	0.0
Issuances of common stock	0.0	0.0
Ending balance	(386.8)	2,967.4
(Accumulated Deficit) Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment | ASC 842 Leases [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance		195.9
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(751.8)	(4,083.4)
Net income	0.0	0.0
Other comprehensive income (loss)	0.0	0.0
Dividends	0.0	0.0
Stock-based compensation	0.0	0.0
Purchases of treasury stock	(2.8)	(11.0)
Issuances of common stock	12.0	5.0
Ending balance	(742.6)	(4,089.4)
Accumulated Other Comprehensive (Loss) Income [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(6.2)	(5.6)
Net income	0.0	0.0
Other comprehensive income (loss)	0.3	(0.2)
Dividends	0.0	0.0
Stock-based compensation	0.0	0.0
Purchases of treasury stock	0.0	0.0
Issuances of common stock	0.0	0.0
Ending balance	$ (5.9)	$ (5.8)