Cash, Cash Equivalents and Short-term Investments - Unrealized Losses (Details) - USD ($) $ in Millions	Dec. 27, 2025	Jun. 28, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Fair value, more than 12 months	$ 1.0	$ 0.0
Unrealized losses, more than 12 months	0.0	0.0
Fair value, less than 12 months	151.0	138.8
Unrealized losses, less than 12 months	(0.1)	(0.1)
Gross Unrealized Losses	(0.1)	(0.1)
U.S. Agency securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Fair value, more than 12 months	0.0	0.0
Unrealized losses, more than 12 months	0.0	0.0
Fair value, less than 12 months	68.4	24.5
Unrealized losses, less than 12 months	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Commercial paper
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Fair value, more than 12 months	0.0	0.0
Unrealized losses, more than 12 months	0.0	0.0
Fair value, less than 12 months	9.9	5.2
Unrealized losses, less than 12 months	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Corporate debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Fair value, more than 12 months	1.0	0.0
Unrealized losses, more than 12 months	0.0	0.0
Fair value, less than 12 months	69.2	73.8
Unrealized losses, less than 12 months	(0.1)	(0.1)
Gross Unrealized Losses	(0.1)	(0.1)
U.S. government bonds
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss
Fair value, more than 12 months	0.0	0.0
Unrealized losses, more than 12 months	0.0	0.0
Fair value, less than 12 months	3.5	35.3
Unrealized losses, less than 12 months	0.0	0.0
Gross Unrealized Losses	$ 0.0	$ 0.0