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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. 29, 2018
Sep. 30, 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 (3,636) (667)
Contracts purchased during the period 1,546 3,686
Change in the fair value of outstanding contracts (472) 280
Ending balance of over-the-counter options 1,546 4,108
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 361 737
Change in the fair value of outstanding contracts 0 0
Ending balance of over-the-counter options $ 361 $ 737