CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	Accumulated Other Comprehensive Loss	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings (Accumulated Deficit)
Balance, shares at Jun. 27, 2018		40.8
Balance at Jun. 27, 2018	$ (718.3)	$ 17.6	$ 511.6	$ 2,683.0	$ (3,924.7)	$ (5.8)
Balance (Accounting Standards Update 2014-09 [Member]) at Jun. 27, 2018							$ (7.4)	$ (7.4)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net income	154.9	0.0	0.0	154.9	0.0	0.0
Other comprehensive income (loss)	$ 0.2	0.0	0.0	0.0	0.0	0.2
Common stock dividends per share declared	$ 1.52
Dividends	$ (59.3)	0.0	0.0	(59.3)	0.0	0.0
Stock-based compensation	16.4	$ 0.0	16.4	0.0	0.0	0.0
Purchases of treasury stock, shares		(3.6)
Purchases of treasury stock	(167.7)	$ 0.0	(0.6)	0.0	(167.1)	0.0
Issuances of common stock, shares		0.3
Issuances of common stock	3.0	$ 0.0	(5.4)	0.0	8.4	0.0
Balance, shares at Jun. 26, 2019		37.5
Balance at Jun. 26, 2019	(778.2)	$ 17.6	522.0	2,771.2	(4,083.4)	(5.6)
Balance (Accounting Standards Update 2016-02 [Member]) at Jun. 26, 2019							$ 195.9	$ 195.9
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net income	24.4	0.0	0.0	24.4	0.0	0.0
Other comprehensive income (loss)	$ (0.6)	0.0	0.0	0.0	0.0	(0.6)
Common stock dividends per share declared	$ 1.14
Dividends	$ (43.6)	0.0	0.0	(43.6)	0.0	0.0
Stock-based compensation	$ 14.7	$ 0.0	14.7	0.0	0.0	0.0
Purchases of treasury stock, shares	(0.8)	(0.8)
Purchases of treasury stock	$ (32.4)	$ 0.0	(0.3)	0.0	(32.1)	0.0
Issuances of common stock, shares		8.3
Issuances of common stock	$ 140.7	$ 0.8	133.0	0.0	6.9	0.0
Retirement of treasury stock, shares	114.0	0.0
Retirement of treasury stock	$ 0.0	$ (11.4)	0.0	(3,345.4)	3,356.8	0.0
Balance, shares at Jun. 24, 2020	45.0	45.0
Balance at Jun. 24, 2020	$ (479.1)	$ 7.0	669.4	(397.5)	(751.8)	(6.2)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net income	131.6	0.0	0.0	131.6	0.0	0.0
Other comprehensive income (loss)	1.5	0.0	0.0	0.0	0.0	1.5
Dividends	(0.2)	0.0	0.0	(0.2)	0.0	0.0
Stock-based compensation	$ 16.4	$ 0.0	16.4	0.0	0.0	0.0
Purchases of treasury stock, shares	(0.1)	(0.1)
Purchases of treasury stock	$ (4.2)	$ 0.0	(1.2)	0.0	(3.0)	0.0
Issuances of common stock, shares		1.0
Issuances of common stock	$ 30.7	$ 0.0	0.8	0.0	29.9	0.0
Balance, shares at Jun. 30, 2021	45.9	45.9
Balance at Jun. 30, 2021	$ (303.3)	$ 7.0	$ 685.4	$ (266.1)	$ (724.9)	$ (4.7)