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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
6 Months Ended
Mar. 25, 2017
Mar. 26, 2016
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 $ 809 $ 2,781
Beginning balance realized during the period (369) (1,738)
Contracts purchased during the period 0 173
Change in the fair value of outstanding contracts (143) (479)
Ending balance of over-the-counter options 297 737
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 0 347
Beginning balance realized during the period 0 (96)
Contracts purchased during the period 0 0
Change in the fair value of outstanding contracts 0 (201)
Ending balance of over-the-counter options $ 0 $ 50