Recently Issued Accounting Pronouncements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Jan. 01, 2022	Jan. 02, 2021	Jul. 03, 2021
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt					$ 456.6
Long-term debt	$ 755.8		$ 755.8		224.1
Mezzanine equity - convertible notes					0.0
Additional paid-in capital					70,183.2
Accumulated deficit	(69,470.4)		(69,470.4)		(69,322.3)
Income Statement [Abstract]
Interest Expense	(7.1)	$ (3.6)	(10.7)	$ (7.2)
Net income	$ 34.6	$ 27.3	$ (20.2)	$ 47.0
Net income (loss) per share:
Basic (in dollars per share)	$ 0.15	$ 0.12	$ (0.09)	$ 0.21
Diluted (in dollars per share)	$ 0.14	$ 0.12	$ (0.09)	$ 0.20
Shares used in per-share calculation:
Basic (in shares)	236.0	228.8	233.6	228.8
Diluted (in shares)	242.3	231.1	233.6	231.5
As Reported
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt					414.2
Long-term debt					209.8
Mezzanine equity - convertible notes					45.8
Additional paid-in capital					70,265.5
Accumulated deficit					(69,393.7)
Income Statement [Abstract]
Interest Expense		$ (9.0)		$ (18.0)
Net income		$ 21.9		$ 36.2
Net income (loss) per share:
Basic (in dollars per share)		$ 0.10		$ 0.16
Diluted (in dollars per share)		$ 0.09		$ 0.16
Shares used in per-share calculation:
Basic (in shares)		228.8		228.8
Diluted (in shares)		231.1		231.3
ASU 2020-06
Income Statement [Abstract]
Interest Expense					21.4
Net income					21.4
ASU 2020-06 | Adjustment
LIABILITIES AND STOCKHOLDERS’ EQUITY
Short-term debt					42.4
Long-term debt					14.3
Mezzanine equity - convertible notes					(45.8)
Additional paid-in capital					(82.3)
Accumulated deficit					$ 71.4
Income Statement [Abstract]
Interest Expense		$ 5.4		$ 10.8
Net income		$ 5.4		$ 10.8
Net income (loss) per share:
Basic (in dollars per share)		$ 0.02		$ 0.05
Diluted (in dollars per share)		$ 0.03		$ 0.04
Shares used in per-share calculation:
Basic (in shares)		0.0		0.0
Diluted (in shares)		0.0		0.2