CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit
Balance at the beginning of the period (in shares) at Jun. 29, 2019		228,800
Balance at the beginning of the period at Jun. 29, 2019	$ 725.8	$ 0.2	$ 70,244.7	$ (69,384.5)	$ (134.6)	$ 3.0	$ 3.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6.8			6.8
Other comprehensive income (loss)	(26.7)				(26.7)
Shares issued under employee stock plans, net of tax (in shares)		1,700
Shares issued under employee stock plans, net of tax	(9.7)		(9.7)
Stock-based compensation	10.4		10.4
Repurchase of common stock (in shares)		(100)
Repurchase of common stock	(1.5)			(1.5)
Balance at the end of the period (in shares) at Sep. 28, 2019		230,400
Balance at the end of the period at Sep. 28, 2019	708.1	$ 0.2	70,245.4	(69,376.2)	(161.3)
Balance at the beginning of the period (in shares) at Jun. 27, 2020		228,300
Balance at the beginning of the period at Jun. 27, 2020	711.4	$ 0.2	70,274.3	(69,397.2)	(165.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14.3			14.3
Other comprehensive income (loss)	28.4				28.4
Shares issued under employee stock plans, net of tax (in shares)		1,600
Shares issued under employee stock plans, net of tax	(6.1)		(6.1)
Stock-based compensation	$ 12.5		12.5
Repurchase of common stock (in shares)	(565)	(600)
Repurchase of common stock	$ (6.7)			(6.7)
Balance at the end of the period (in shares) at Oct. 03, 2020		229,300
Balance at the end of the period at Oct. 03, 2020	$ 753.8	$ 0.2	$ 70,280.7	$ (69,389.6)	$ (137.5)