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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. 26, 2016
Mar. 28, 2015
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 $ 2,781 $ 1,512
Beginning balance realized during the period (1,738) (910)
Contracts purchased during the period 173 461
Change in the fair value of outstanding contracts (479) 2,755
Ending balance of over-the-counter options 737 3,818
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 347 0
Beginning balance realized during the period (96) 0
Contracts purchased during the period 0 0
Change in the fair value of outstanding contracts (201) 0
Ending balance of over-the-counter options $ 50 $ 0