SHAREHOLDERS' DEFICIT (Changes in Shareholders' Deficit) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 29, 2021	Sep. 23, 2020
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	$ (303.3)	$ (479.1)
Net income	13.2	10.7
Other comprehensive income (loss)	(0.4)	0.3
Dividends	0.0	0.0
Stock-based compensation	4.3	3.9
Purchases of treasury stock	(39.6)	(3.9)
Issuances of treasury stock	0.3	3.0
Ending balance	(325.5)	(465.1)
Common Stock [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	7.0	7.0
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 treasury stock	0.0	0.0
Ending balance	7.0	7.0
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	685.4	669.4
Net income	0.0	0.0
Other comprehensive income (loss)	0.0	0.0
Dividends	0.0	0.0
Stock-based compensation	4.3	3.9
Purchases of treasury stock	(2.0)	(1.1)
Issuances of treasury stock	(8.3)	(9.0)
Ending balance	679.4	663.2
Accumulated Deficit [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(266.1)	(397.5)
Net income	13.2	10.7
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 treasury stock	0.0	0.0
Ending balance	(252.9)	(386.8)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(724.9)	(751.8)
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	(37.6)	(2.8)
Issuances of treasury stock	8.6	12.0
Ending balance	(753.9)	(742.6)
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Beginning balance	(4.7)	(6.2)
Net income	0.0	0.0
Other comprehensive income (loss)	(0.4)	0.3
Dividends	0.0	0.0
Stock-based compensation	0.0	0.0
Purchases of treasury stock	0.0	0.0
Issuances of treasury stock	0.0	0.0
Ending balance	$ (5.1)	$ (5.9)