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Earnings Per Limited Partner Unit - Net Income Allocation and Per Unit Data (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Basic and Diluted Earnings Per Limited Partner:    
Net income $ 13,539 $ 14,489
Less General Partner's interest in net income 122 122
Net income available to limited partners 13,417 14,367
Less dilutive impact of theoretical distribution of earnings [1] 1,723 1,883
Limited Partner's interest in net income $ 11,694 $ 12,484
Per unit data:    
Basic and diluted net income available to limited partners $ 0.37 $ 0.37
Less dilutive impact of theoretical distribution of earnings (0.04) 0.05 [1]
Limited Partner's interest in net income $ 0.33 $ 0.32
Weighted average number of Limited Partner units outstanding, Basic 35,916 38,789
Weighted average number of Limited Partner units outstanding, Diluted 35,916 38,789
[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.