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Investments - Marketable Investments by Type (Details) - USD ($) $ in Millions | Jun. 27, 2021 | Jun. 28, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 770.5 | $ 782.0
Gross Unrealized Gains | 5.5 | 8.9
Gross Unrealized Losses | 0.4 | 0.0
Estimated Fair Value | 775.6 | 790.9
Maximum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses |  | 0.1
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 139.4 | 130.0
Gross Unrealized Gains | 1.9 | 2.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 141.3 | 132.0
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 456.5 | 473.8
Gross Unrealized Gains | 3.3 | 6.3
Gross Unrealized Losses | 0.3 | 0.0
Estimated Fair Value | 459.5 | 480.1
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15.8 | 29.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 15.8 | 29.1
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 72.3 | 52.3
Gross Unrealized Gains | 0.3 | 0.6
Gross Unrealized Losses | 0.1 | 0.0
Estimated Fair Value | 72.5 | 52.9
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16.5 | 83.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 16.5 | 83.3
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 50.0 | 11.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 50.0 | 11.0
Variable rate demand note |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20.0 | 2.5
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | $ 20.0 | $ 2.5

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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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