CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings
Balance, shares at Jun. 28, 2017		48.4
Balance at Jun. 28, 2017	$ (493.6)	$ 17.6	$ 502.1	$ 2,627.1	$ (3,628.5)	$ (11.9)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net income	125.9	0.0	0.0	125.9	0.0	0.0
Other comprehensive income (loss)	0.2	0.0	0.0	0.0	0.0	0.2
Dividends	(70.0)	0.0	0.0	(70.0)	0.0	0.0
Stock-based compensation	14.2	0.0	14.2	0.0	0.0	0.0
Purchases of treasury stock	(303.2)	$ 0.0	(0.2)	0.0	(303.0)	0.0
Purchases of treasury stock, shares		(7.9)
Issuances of common stock	2.3	$ 0.0	(4.5)	0.0	6.8	0.0
Issuances of common stock, shares		0.3
Disposition of equity method investment	5.9	$ 0.0	0.0	0.0	0.0	5.9
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
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	$ (167.7)	$ 0.0	(0.6)	0.0	(167.1)	0.0
Purchases of treasury stock, shares	(3.6)	(3.6)
Issuances of common stock	$ 3.0	$ 0.0	(5.4)	0.0	8.4	0.0
Issuances of common stock, shares		0.3
Balance, shares at Jun. 26, 2019	37.5	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)
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	$ (32.4)	$ 0.0	(0.3)	0.0	(32.1)	0.0
Purchases of treasury stock, shares	(0.8)	(0.8)
Issuances of common stock	$ 140.7	$ 0.8	133.0	0.0	6.9	0.0
Issuances of common stock, shares		8.3
Retirement of treasury stock	$ 0.0	$ (11.4)	0.0	(3,345.4)	3,356.8	0.0
Retirement of treasury stock, shares	114.0	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)