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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
12 Months Ended
Sep. 30, 2017
Sep. 24, 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 (667) (2,781)
Contracts purchased during the period 3,686 809
Change in the fair value of outstanding contracts 280 0
Ending balance of over-the-counter options 4,108 809
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 (347)
Contracts purchased during the period 737 0
Change in the fair value of outstanding contracts 0 0
Ending balance of over-the-counter options $ 737 $ 0