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Investments - Narrative (Details)
Mar. 26, 2023
USD ($)
security
Jun. 26, 2022
USD ($)
security
Net Investment Income [Line Items]    
Number of instruments in loss position | security 67 346
Fair value of instruments in loss position $ 279,700,000 $ 650,800,000
Unrealized loss 600,000 22,600,000
Accrued interest receivable 12,000,000.0 5,900,000
Credit Loss Allowance $ 0 $ 0
Cash and Cash Equivalents    
Net Investment Income [Line Items]    
Number of instruments in loss position | security 1 6
Fair value of instruments in loss position $ 14,800,000 $ 69,000,000
Unrealized loss $ 100,000 $ 100,000