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Earnings per Limited Partner Units - Net Income Allocation and Per Unit Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Basic and Diluted Earnings Per Limited Partner:                      
Net income $ (19,729) $ (23,906) $ 62,041 $ 13,539 $ (49,993) $ (10,587) $ 81,379 $ 14,489 $ 31,945 $ 35,288 $ 87,737
Less General Partners' interest in net income                 288 281 689
Net income available to limited partners $ (19,549) $ (23,690) $ 61,479 $ 13,417 $ (49,548) $ (10,494) $ 80,682 $ 14,367 31,657 35,007 87,048
Less dilutive impact of theoretical distribution of earnings [1]                 2,600 3,230 13,163
Limited Partner’s interest in net income                 $ 29,057 $ 31,777 $ 73,885
Per unit data:                      
Basic and diluted net income available to limited partners                 $ 0.89 $ 0.94 $ 2.15
Less dilutive impact of theoretical distribution of earnings [1]                 0.08 0.09 0.33
Limited Partner’s interest in net income under $ (0.55) [2] $ (0.67) [2] $ 1.42 [2] $ 0.33 [2] $ (1.36) [2] $ (0.29) [2] $ 1.75 [2] $ 0.32 [2] $ 0.81 [2],[3] $ 0.85 [2],[3] $ 1.82 [3]
Weighted average number of Limited Partner units outstanding: Basic                 35,694 37,384 40,553
Weighted average number of Limited Partner units outstanding: Diluted                 35,694 37,384 40,553
[1] In any accounting period where the Company’s aggregate net income exceeds its aggregate distribution for such period, the Company is required to present net income per limited partner unit as if all of the earnings for the period were distributed, based on the terms of the Partnership agreement, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Company’s overall net income or other financial results.
[2] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.
[3] See Note 19 - Earnings Per Limited Partner Units.