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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sales:        
Total sales $ 666,032 $ 737,617 $ 1,194,128 $ 1,385,804
Cost and expenses:        
(Increase) decrease in the fair value of derivative instruments [1] (11,752) 3,022 7,278 20,658
Delivery and branch expenses 104,085 95,942 198,449 193,878
Depreciation and amortization expenses 7,748 7,626 16,134 15,463
General and administrative expenses 6,887 6,698 13,908 13,554
Finance charge income (1,253) (1,764) (2,024) (3,083)
Operating income 100,331 91,515 121,952 115,120
Interest expense, net (3,838) (4,963) (7,056) (9,237)
Amortization of debt issuance costs (249) (258) (499) (587)
Income before income taxes 96,244 86,294 114,397 105,296
Income tax expense 27,870 24,253 33,044 29,716
Net income 68,374 62,041 81,353 75,580
General Partner's interest in net income 620 562 738 684
Limited Partners' interest in net income $ 67,754 $ 61,479 $ 80,615 $ 74,896
Basic and diluted income per Limited Partner Unit: [2] $ 1.56 $ 1.42 $ 1.88 $ 1.74
Weighted average number of Limited Partner units outstanding:        
Weighted average number of Limited Partner units outstanding, Basic 35,549 35,653 35,571 35,786
Weighted average number of Limited Partner units outstanding, Diluted 35,549 35,653 35,571 35,786
Product        
Sales:        
Total sales $ 595,298 $ 669,212 $ 1,043,848 $ 1,239,141
Installations and services        
Sales:        
Total sales 70,734 68,405 150,280 146,663
Cost of product        
Cost and expenses:        
Cost and expenses 389,394 466,267 692,732 885,360
Cost of installations and services        
Cost and expenses:        
Cost and expenses $ 70,592 $ 68,311 $ 145,699 $ 144,854
[1] Represents the change in value of unrealized open positions and expired options.
[2] See Note 15 - Earnings Per Limited Partner Unit.