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Quarterly Distribution of Available Cash - Additional Information (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 28, 2024
Feb. 27, 2024
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Quarterly Financial Information Disclosure [Line Items]          
Minimum distribution of available cash per unit     $ 0.0675    
Common units distribution amount on annualized basis     $ 0.27    
First tier, percentage of cash distribution to common units minimum quarterly distribution     100.00%    
Second tier, percentage of available cash distribution to common units for any arrearages     100.00%    
Third tier, percentage of available cash distribution to general partner unit holder until minimum quarterly distribution is met     100.00%    
Fourth tier, percentage of distributions to common unit holders until first target distribution is met     90.00%    
Fourth tier, percentage of distributions to general partner unit holder until first target distribution is met     10.00%    
First target distribution     $ 0.1125    
Thereafter, percentage of distributions to common unit holders after first target distribution is met     80.00%    
Thereafter, percentage of distributions to general partner unit holders after first target distribution is met     20.00%    
Percentage of excess availability of revolving commitment that must be maintained     15.00%    
Annual cash distributions declared per common unit     $ 0.630 $ 0.590 $ 0.550
General partner incentive distributions exclusive of amounts paid subject to management incentive plan | $     $ 1.2 $ 1.0 $ 0.9
Scenario Forecast          
Quarterly Financial Information Disclosure [Line Items]          
Fixed charge coverage ratio that must be maintained to make distributions 1.15 1