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Fair Value Measures - Narrative (Details) - USD ($)
Dec. 30, 2023
Sep. 30, 2023
Dec. 24, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Cash and cash equivalents $ 485,952,000 $ 258,770,000 $ 350,724,000
Fair Value, Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total liabilities 0 $ 0  
U.S. Treasury securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amortized cost 184,400,000    
Gross unrealized gain 4,600,000    
Gross unrealized loss 0    
Fair value 189,000,000    
Cash and cash equivalents $ 0