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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 | 84 Months Ended | 97 Months Ended
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Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | Nov. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jul. 31, 2020
Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  |  |  |  | 255 | 159 |  | 725 |  |  | 1,139 | 1,155 |  | 782 |  | 1,281 |  | 4,357 | 13,340 | 14,400
Average Price Paid per Unit | [1] |  |  |  |  | $ 9.63 | $ 9.33 |  | $ 8.97 |  |  | $ 9.17 | $ 8.15 |  | $ 8.33 |  | $ 9.42 |  | $ 8.82 | $ 8.08 |
Maximum Number of Units that May Yet Be Purchased |  |  |  |  |  | 5,730 | 5,985 | [2] | 2,144 |  |  | 5,730 | 2,869 | [3] | 524 | [4] | 306 | [5] | 5,730 | 956 | 2,144
Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 1,553 |  | 308 |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |
Average Price Paid per Unit |  | $ 9.83 | [1] | $ 9.64 | [1] |  |  |  |  | $ 9.65 |  |  |  |  |  |  |  |  |  |  |
Maximum Number of Units that May Yet Be Purchased |  | 5,269 | [6],[7] | 5,422 |  |  |  |  |  | 5,269 | [6],[7] |  |  |  |  |  |  |  |  |  |
Publicly Announced Plans or Programs As Part of Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  |  |  |  | 255 | 159 |  | 725 |  |  | 1,139 | 1,155 |  | 782 |  | 650 |  | 3,726 | 10,896 |
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 153 |  | 308 |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |
[1] | Amounts include repurchase costs.
[2] | In August 2020, the Board authorized an increase in the number of Common Units available for repurchase from 2.0 million to 6.0 million
[3] | In May 2020, the Board authorized an increase in the number of Common Units available for repurchase from 0.1 million to 3.6 million.
[4] | In February 2020, the Board authorized an increase in the number of Common Units available for repurchase from 0.1 million to 1.1 million.
[5] | First quarter of fiscal year 2020 Common Units repurchased include 0.6 million common units acquired in a private transaction.
[6] | Of the total available for repurchase, approximately 4.2 million are available for repurchase in open market transactions and 1.1 million are available for repurchase in privately-negotiated transactions.
[7] | On November 16, 2020, the Company entered into a Unit Purchase Agreement with Moab Partners, L.P. and purchased 1.4 million Common Units in a private transaction for aggregate consideration of approximately $13.8 million. The purchase was made outside of the Company’s unit repurchase plan.

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