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Investments - Narrative (Details)
Jun. 26, 2022
USD ($)
security
Jun. 27, 2021
USD ($)
security
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