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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. 30, 2019
Mar. 31, 2018
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 (1,179) (2,466)
Contracts purchased during the period 0 800
Change in the fair value of outstanding contracts 869 (1,008)
Ending balance of over-the-counter options 1,236 1,434
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 (287) (532)
Contracts purchased during the period 0 0
Change in the fair value of outstanding contracts (74) (205)
Ending balance of over-the-counter options $ 0 $ 0