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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions	Sep. 24, 2023 USD ($) security	Jun. 25, 2023 USD ($) security
Fair Value
Less than 12 Months	$ 906.8	$ 520.9
Greater than 12 Months	414.2	463.1
Total	1,321.0	984.0
Unrealized Loss
Less than 12 Months	(1.6)	(1.6)
Greater than 12 Months	(19.2)	(21.1)
Total	$ (20.8)	$ (22.7)
Number of securities with an unrealized loss
Less than 12 Months | security	119	95
Greater than 12 Months | security	209	234
Total | security	328	329
U.S. treasury securities
Fair Value
Less than 12 Months	$ 631.5	$ 229.3
Greater than 12 Months	26.3	31.1
Total	657.8	260.4
Unrealized Loss
Less than 12 Months	(0.7)	(0.5)
Greater than 12 Months	(0.7)	(0.9)
Total	(1.4)	(1.4)
Corporate bonds
Fair Value
Less than 12 Months	157.5	151.5
Greater than 12 Months	292.2	324.1
Total	449.7	475.6
Unrealized Loss
Less than 12 Months	(0.5)	(0.5)
Greater than 12 Months	(14.4)	(16.2)
Total	(14.9)	(16.7)
Municipal bonds
Fair Value
Less than 12 Months	43.2	61.4
Greater than 12 Months	93.7	105.9
Total	136.9	167.3
Unrealized Loss
Less than 12 Months	(0.2)	(0.4)
Greater than 12 Months	(4.1)	(4.0)
Total	(4.3)	(4.4)
U.S. agency securities
Fair Value
Less than 12 Months	70.6	74.8
Greater than 12 Months	2.0	2.0
Total	72.6	76.8
Unrealized Loss
Less than 12 Months	(0.2)	(0.2)
Greater than 12 Months	0.0	0.0
Total	(0.2)	(0.2)
Commercial paper
Fair Value
Less than 12 Months	4.0	3.9
Greater than 12 Months	0.0	0.0
Total	4.0	3.9
Unrealized Loss
Less than 12 Months	0.0	0.0
Greater than 12 Months	0.0	0.0
Total	$ 0.0	$ 0.0

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