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Investments - Marketable Investments by Type (Details) - USD ($) $ in Millions	Jun. 28, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 794.0	$ 548.4
Gross Unrealized Gains	8.9	2.6
Gross Unrealized Losses	0.0	(0.1)
Estimated Fair Value	802.9	550.9
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	130.0	78.2
Gross Unrealized Gains	2.0	0.4
Gross Unrealized Losses	0.0	(0.1)
Estimated Fair Value	132.0	78.5
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	473.8	256.0
Gross Unrealized Gains	6.3	1.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	480.1	257.0
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29.1	25.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	29.1	25.6
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52.3	92.4
Gross Unrealized Gains	0.6	0.1
Gross Unrealized Losses	0.0
Estimated Fair Value	52.9	92.5
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95.3	71.5
Gross Unrealized Gains	0.0	1.1
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	95.3	72.6
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11.0	7.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	11.0	7.8
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2.5	16.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	$ 2.5	$ 16.9

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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