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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
3 Months Ended
Dec. 29, 2018
Dec. 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 $ 1,546 $ 4,108
Beginning balance realized during the period (393) (313)
Contracts purchased during the period 0 0
Change in the fair value of outstanding contracts 2,157 122
Ending balance of over-the-counter options 3,310 3,917
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 361 737
Beginning balance realized during the period (46) 0
Contracts purchased during the period 0 0
Change in the fair value of outstanding contracts (315) (305)
Ending balance of over-the-counter options $ 0 $ 432