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Investments - Narrative (Details) | Jun. 26, 2022 USD ($) security | Jun. 27, 2021 USD ($) security
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Net Investment Income [Line Items] |  |
Number of instruments in a loss position | security | 346 | 128
Fair value of instruments in loss position | $ 650,800,000 | $ 206,500,000
Accrued interest receivable | 5,900,000 | $ 5,500,000
Allowance for credit losses | $ 0 |
Cash and Cash Equivalents |  |
Net Investment Income [Line Items] |  |
Number of instruments in a loss position | security | 6 | 6
Fair value of instruments in loss position | $ 69,000,000 | $ 21,400,000
Unrealized loss | $ 100,000 | $ 100,000

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