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Common Unit Repurchase Plans and Retirement - Company's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended 72 Months Ended 85 Months Ended
Nov. 30, 2019
Oct. 31, 2019
Sep. 30, 2019
Aug. 31, 2019
Jul. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 31, 2019
Repurchase Plan                        
Capital Unit [Line Items]                        
Total Number of Units Purchased     1,362 223 147 1,732 885 2,187 599 5,403 7,937 9,500
Average Price Paid per Unit [1]     $ 9.41 $ 9.67 $ 9.76 $ 9.47 $ 9.68 $ 9.44 $ 9.57 $ 9.50 $ 7.11  
Maximum Number of Units that May Yet Be Purchased     956 [2] 2,318 [3] 1,541 956 [2] 1,688 2,573 [4] 4,760 956 [2] 5,359 1,541
Repurchase Plan | Subsequent Event                        
Capital Unit [Line Items]                        
Total Number of Units Purchased 261 223                    
Average Price Paid per Unit [1] $ 9.39 $ 9.44                    
Maximum Number of Units that May Yet Be Purchased 472 [5] 733                    
Publicly Announced Plans or Programs As Part of Repurchase Plan                        
Capital Unit [Line Items]                        
Total Number of Units Purchased     1,362 223 147 1,732 885 2,187 599 5,403 5,493  
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event                        
Capital Unit [Line Items]                        
Total Number of Units Purchased 261 223                    
[1] Amounts include repurchase costs.
[2] September 2019 common units repurchased include 1.2 million common units acquired in a private transaction.
[3] In August 2019, the Board authorized an increase in the number of Common Units available for repurchase from 1.3 million to 2.3 million.
[4] Second quarter of fiscal year 2019 common units repurchased include 1.2 million common units acquired in a private transaction.
[5] Of the total available for repurchase, approximately 0.4 million are available for repurchase in open market transactions and 0.1 million are available for repurchase in privately-negotiated transactions.