Cash, Cash Equivalents and Short-term Investments - Unrealized Losses (Details) - USD ($) $ in Millions	Jun. 27, 2026	Jun. 28, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less Than 12 Months	$ 582.2	$ 138.8
Unrealized Losses, More Than 12 Months	(2.0)	(0.1)
Gross Unrealized Losses	(2.0)	(0.1)
U.S. Agency securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less Than 12 Months	130.5	24.5
Unrealized Losses, More Than 12 Months	(0.4)	0.0
Gross Unrealized Losses	(0.4)	0.0
Commercial paper
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less Than 12 Months	69.0	5.2
Unrealized Losses, More Than 12 Months	(0.1)	0.0
Gross Unrealized Losses	(0.1)	0.0
Corporate debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less Than 12 Months	275.8	73.8
Unrealized Losses, More Than 12 Months	(1.2)	(0.1)
Gross Unrealized Losses	(1.2)	(0.1)
U.S. government bonds
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Fair Value, Less Than 12 Months	106.9	35.3
Unrealized Losses, More Than 12 Months	(0.3)	0.0
Gross Unrealized Losses	$ (0.3)	$ 0.0