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Fair Value Measures - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Jun. 29, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets $ 790,361 $ 506,681
Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 778,053 219,945
Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 12,308 286,736
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
Money market funds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 778,053 219,945
Money market funds | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 778,053 219,945
Money market funds | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
Money market funds | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
U.S. Treasury securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 286,736
U.S. Treasury securities | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
U.S. Treasury securities | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 286,736
U.S. Treasury securities | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
Warrant fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 12,308 0
Warrant fair value | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 0 0
Warrant fair value | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets 12,308 0
Warrant fair value | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total assets $ 0 $ 0