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Investments - Narrative (Details)
Dec. 25, 2022
USD ($)
security
Jun. 26, 2022
USD ($)
security
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