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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Basic and Diluted Earnings Per Limited Partner:                      
Net income $ (49,993) $ (10,587) $ 81,379 $ 14,489 $ (23,233) $ (12,054) $ 85,164 $ 37,860 $ 35,288 $ 87,737 $ 55,918
Less General Partners' interest in net income                 281 689 377
Net income available to limited partners $ (49,548) $ (10,494) $ 80,682 $ 14,367 $ (23,043) $ (11,956) $ 84,483 $ 37,564 35,007 87,048 55,541
Less dilutive impact of theoretical distribution of earnings [1]                 3,230 13,163 6,812
Limited Partner’s interest in net income                 $ 31,777 $ 73,885 $ 48,729
Per unit data:                      
Basic and diluted net income available to limited partners                 $ 0.94 $ 2.15 $ 1.22
Less dilutive impact of theoretical distribution of earnings [1]                 0.09 0.33 0.15
Limited Partner’s interest in net income under $ (1.36) [2] $ (0.29) [2] $ 1.75 [2] $ 0.32 [2] $ (0.58) [2] $ (0.30) [2] $ 1.71 [2] $ 0.74 [2] $ 0.85 [2],[3] $ 1.82 [2],[3] $ 1.07 [3]
Weighted average number of Limited Partner units outstanding: Basic                 37,384 40,553 45,656
Weighted average number of Limited Partner units outstanding: Diluted                 37,384 40,553 45,656
[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.