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Investments - Narrative (Details)
Sep. 24, 2023
USD ($)
security
Jun. 25, 2023
USD ($)
security
Net Investment Income [Line Items]    
Number of instruments in loss position | security 119 95
Fair value of instruments in loss position $ 906,800,000 $ 520,900,000
Unrealized loss 1,600,000 1,600,000
Accrued interest receivable 13,300,000 10,100,000
Allowance for credit losses $ 0 $ 0
Cash and Cash Equivalents    
Net Investment Income [Line Items]    
Number of instruments in loss position | security 6 2
Fair value of instruments in loss position $ 92,600,000 $ 18,500,000
Unrealized loss $ 100,000 $ 100,000