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Financial Instruments and Risk Management - Reconciliation of the Beginning and Ending Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Reconciliation of beginning and ending balances of assets measured at fair value on recurring basis using significant unobservable inputs [Rollforward]    
Beginning balance of over-the-counter options $ 0 $ 419
Beginning balance realized during the period 0 (419)
Contracts purchased during the period 2,675 0
Change in the fair value of outstanding contracts 0 0
Ending balance of over-the-counter options 2,675 0
Reconciliation of beginning and ending balances of liabilities measured at fair value on recurring basis using significant unobservable inputs [Rollforward]    
Beginning balance of over-the-counter options 0 0
Beginning balance realized during the period 0 0
Contracts purchased during the period 182 0
Change in the fair value of outstanding contracts 0 0
Ending balance of over-the-counter options $ 182 $ 0