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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 266,937 $ 300,121 $ 737,617 $ 648,187 $ 296,644 $ 439,101 $ 782,543 $ 488,270 $ 1,952,862 $ 2,006,558 $ 1,497,086
Gross profit for product, installation and service 50,733 64,428 203,039 152,551 47,224 77,305 220,073 139,628 470,751 484,230  
Operating income (loss) (22,989) (29,586) 91,515 23,605 (67,920) (11,496) 117,245 22,624 62,545 60,453 130,200
Income (loss) before income taxes (26,171) (33,196) 86,294 19,002 (71,227) (14,353) 114,279 20,327 45,929 49,026 121,412
Net income (loss) (19,729) (23,906) 62,041 13,539 (49,993) (10,587) 81,379 14,489 31,945 35,288 87,737
Limited Partners’ interest in net income $ (19,549) $ (23,690) $ 61,479 $ 13,417 $ (49,548) $ (10,494) $ 80,682 $ 14,367 $ 31,657 $ 35,007 $ 87,048
Net income (loss) per Limited Partner unit:                      
Basic and diluted income per Limited Partner Unit: $ (0.55) [1] $ (0.67) [1] $ 1.42 [1] $ 0.33 [1] $ (1.36) [1] $ (0.29) [1] $ 1.75 [1] $ 0.32 [1] $ 0.81 [1],[2] $ 0.85 [1],[2] $ 1.82 [2]
[1] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.
[2] See Note 19 - Earnings Per Limited Partner Units.