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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. 30, 2018
Jun. 24, 2017
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 $ 4,108 $ 809
Beginning balance realized during the period (3,277) (589)
Contracts purchased during the period 1,352 0
Change in the fair value of outstanding contracts (800) (115)
Ending balance of over-the-counter options 1,383 105
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 737 0
Beginning balance realized during the period (737) 0
Contracts purchased during the period 158 0
Change in the fair value of outstanding contracts 0 0
Ending balance of over-the-counter options $ 158 $ 0