CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ 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		228.8
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)	34.8			34.8
Other comprehensive income	2.1				2.1
Shares issued under employee stock plans, net of tax (in shares)		2.2
Shares issued under employee stock plans, net of tax	(12.6)		(12.6)
Stock-based compensation	21.9		21.9
Repurchase of common stock (in shares)		(0.8)
Repurchase of common stock	(10.7)			(10.7)
Balance at the end of the period (in shares) at Dec. 28, 2019		230.2
Balance at the end of the period at Dec. 28, 2019	$ 764.3	$ 0.2	70,254.0	(69,357.4)	(132.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Balance at the beginning of the period (in shares) at Sep. 28, 2019		230.4
Balance at the beginning of the period at Sep. 28, 2019	$ 708.1	$ 0.2	70,245.4	(69,376.2)	(161.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	28.0			28.0
Other comprehensive income	28.8				28.8
Shares issued under employee stock plans, net of tax (in shares)		0.5
Shares issued under employee stock plans, net of tax	(2.9)		(2.9)
Stock-based compensation	11.5		11.5
Repurchase of common stock (in shares)		(0.7)
Repurchase of common stock	(9.2)			(9.2)
Balance at the end of the period (in shares) at Dec. 28, 2019		230.2
Balance at the end of the period at Dec. 28, 2019	764.3	$ 0.2	70,254.0	(69,357.4)	(132.5)
Balance at the beginning of the period (in shares) at Jun. 27, 2020		228.3
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)	36.2			36.2
Other comprehensive income	63.5				63.5
Shares issued under employee stock plans, net of tax (in shares)		2.1
Shares issued under employee stock plans, net of tax	(8.6)		(8.6)
Stock-based compensation	$ 22.3		22.3
Repurchase of common stock (in shares)	(1.9)	(1.9)
Repurchase of common stock	$ (23.8)			(23.8)
Balance at the end of the period (in shares) at Jan. 02, 2021		228.5
Balance at the end of the period at Jan. 02, 2021	801.0	$ 0.2	70,288.0	(69,384.8)	(102.4)
Balance at the beginning of the period (in shares) at Oct. 03, 2020		229.3
Balance at the beginning of the period at Oct. 03, 2020	753.8	$ 0.2	70,280.7	(69,389.6)	(137.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21.9			21.9
Other comprehensive income	35.1				35.1
Shares issued under employee stock plans, net of tax (in shares)		0.5
Shares issued under employee stock plans, net of tax	(2.5)		(2.5)
Stock-based compensation	$ 9.8		9.8
Repurchase of common stock (in shares)	(1.3)	(1.3)
Repurchase of common stock	$ (17.1)			(17.1)
Balance at the end of the period (in shares) at Jan. 02, 2021		228.5
Balance at the end of the period at Jan. 02, 2021	$ 801.0	$ 0.2	$ 70,288.0	$ (69,384.8)	$ (102.4)