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Investments - Narrative (Details)	3 Months Ended		9 Months Ended
Investments - Narrative (Details)	Mar. 27, 2022 USD ($) security	Mar. 28, 2021 USD ($)	Mar. 27, 2022 USD ($) security	Mar. 28, 2021 USD ($)	Jun. 27, 2021 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivable	$ 4,400,000		$ 4,400,000		$ 5,500,000
Net Investment Income [Line Items]
Number of instruments in loss position \| security	344		344		128
Fair value of instruments in loss position	$ 653,900,000		$ 653,900,000		$ 206,500,000
Realized gain on sale of investments	0	$ 100,000	300,000	$ 300,000
Credit Loss Allowance	$ 0		$ 0		$ 0
Cash and Cash Equivalents
Net Investment Income [Line Items]
Number of instruments in loss position \| security	6		6		6
Fair value of instruments in loss position	$ 53,900,000		$ 53,900,000		$ 21,400,000
Unrealized loss	100,000		$ 100,000		$ 100,000
Maximum
Net Investment Income [Line Items]
Realized gain on sale of investments	$ (100,000)