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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
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.