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Investments - Short-term Investments by Type (Details) - USD ($) | Sep. 25, 2022 | Jun. 26, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 705,500,000 | $ 772,200,000
Gross Unrealized Gains | 0 | 100,000
Gross Unrealized Losses | (29,900,000) | (23,000,000.0)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 675,600,000 | 749,300,000
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 439,300,000 | 465,800,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (22,400,000) | (17,800,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 416,900,000 | 448,000,000.0
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 156,900,000 | 166,500,000
Gross Unrealized Gains | 0 | 100,000
Gross Unrealized Losses | (6,200,000) | (4,400,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 150,700,000 | 162,200,000
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 56,500,000 | 66,500,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,200,000) | (700,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 55,300,000 | 65,800,000
Variable rate demand notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 50,800,000 | 69,400,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Credit Loss Allowance | 0 | 0
Estimated Fair Value | 50,800,000 | 69,400,000
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000,000.0 | 4,000,000.0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (100,000) | (100,000)
Credit Loss Allowance | 0 | 0
Estimated Fair Value | $ 1,900,000 | $ 3,900,000

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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