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Financial Instruments and Risk Management - Fair Value of Partnership's Recognized Derivative Assets and Liabilities on a Gross Basis and Amounts Offset on Condensed Consolidated Balance Sheets (Details) - Commodity-Related Derivatives [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Asset Derivatives [Abstracts] |  |
Gross amounts | $ 19,688 | $ 16,378
Effects of netting | (8,577) | (4,443)
Net amounts presented in the balance sheet | 11,111 | 11,935
Liability Derivatives [Abstracts] |  |
Gross amounts | 13,539 | 6,853
Effects of netting | (8,577) | (4,443)
Net amounts presented in the balance sheet | $ 4,962 | $ 2,410

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