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Common Unit Repurchase Plans and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 131 Months Ended | 144 Months Ended
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Jul. 31, 2025 | Nov. 30, 2025 | [3] | Oct. 31, 2025 | [4] | Sep. 30, 2025 | Aug. 31, 2025 | Nov. 30, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | [1] | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2025 | May 31, 2023 | Sep. 30, 2024
Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 144 |  |  |  |  | 157 | 172 |  |  | 473 | 817 | 6 | 13 | 1,309 | 20,500 | 26,438
Average Price Paid per Unit | [2] | $ 11.87 |  |  |  |  | $ 11.73 | $ 11.74 |  |  | $ 11.78 | $ 12.01 | $ 11.24 | $ 11.2 | $ 11.92 |  | $ 8.9
Maximum Number of Units that May Yet Be Purchased |  | 1,272 |  |  |  |  | 943 | 1,100 |  |  | 943 | 1,416 | 1,533 | 1,539 | 943 |  | 1,552
Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  | 67 |  | 234 |  |  |  | 300 |  |  |  |  |  |  |  |
Average Price Paid per Unit |  |  | $ 11.83 | [2] | $ 11.87 | [2] |  |  | $ 11.86 |  |  |  |  |  |  |  |
Maximum Number of Units that May Yet Be Purchased |  |  | 642 |  | 709 |  |  |  | 642 | [3] |  |  |  |  |  |  |
Publicly Announced Plans or Programs As Part of Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 144 |  |  |  |  | 157 | 172 |  |  | 473 | 117 | 6 | 13 | 609 |  | 21,550
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  | 67 |  | 234 |  |  |  |  |  |  |  |  |  |  |  |
[1] | In May 2025, the Company purchased 700,000 Common Units in a private transaction for aggregate consideration of approximately $8.4 million. The purchase was made outside the Company’s unit repurchase plan.
[2] | Amounts include repurchase costs.
[3] | Of the total available for repurchase, approximately 0.5 million are available for repurchase in open market transactions and 0.1 million are available for repurchase in privately-negotiated transactions.
[4] | In October 2025, the Company purchased 138,600 Common Units in a private transaction for aggregate consideration of approximately $1.6 million. The purchase was made within the Company’s unit repurchase plan.

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