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Investments - Narrative (Details) | Dec. 25, 2022 USD ($) security | Jun. 26, 2022 USD ($) security
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Net Investment Income [Line Items] |  |
Number of instruments in loss position | security | 265 | 346
Fair value of instruments in loss position | $ 608,100,000 | $ 650,800,000
Unrealized loss | 16,400,000 | 22,600,000
Accrued interest receivable | 11,200,000 | 5,900,000
Credit Loss Allowance | $ 0 | $ 0
Cash and Cash Equivalents |  |
Net Investment Income [Line Items] |  |
Number of instruments in loss position | security | 10 | 6
Fair value of instruments in loss position | $ 104,700,000 | $ 69,000,000
Unrealized loss | $ 100,000 | $ 100,000

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