Investments - Short-term Investments by Type (Details) - USD ($)	Sep. 25, 2022	Jun. 26, 2022
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

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).

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

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Amount, before tax, of unrealized loss 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

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-Publisher FASB
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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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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), classified as current.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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