CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Sales:
Total sales		$ 737,617	$ 782,543	$ 1,385,804	$ 1,270,813
Cost and expenses:
(Increase) decrease in the fair value of derivative instruments	[1]	3,022	(17,615)	20,658	(4,212)
Delivery and branch expenses		95,942	107,486	193,878	196,475
Depreciation and amortization expenses		7,626	8,081	15,463	16,529
General and administrative expenses		6,698	5,902	13,554	12,578
Finance charge income		(1,764)	(1,026)	(3,083)	(1,538)
Operating income		91,515	117,245	115,120	139,869
Interest expense, net		(4,963)	(2,729)	(9,237)	(4,787)
Amortization of debt issuance costs		(258)	(237)	(587)	(476)
Income before income taxes		86,294	114,279	105,296	134,606
Income tax expense		24,253	32,900	29,716	38,738
Net income		62,041	81,379	75,580	95,868
General Partner's interest in net income		562	697	684	819
Limited Partners' interest in net income		$ 61,479	$ 80,682	$ 74,896	$ 95,049
Basic and diluted income per Limited Partner Unit (1):		$ 1.42	$ 1.75	$ 1.74	$ 2.05
Weighted average number of Limited Partner units outstanding:
Weighted average number of Limited Partner units outstanding, Basic		35,653	37,634	35,786	38,218
Weighted average number of Limited Partner units outstanding, Diluted		35,653	37,634	35,786	38,218
Product
Sales:
Total sales		$ 669,212	$ 712,462	$ 1,239,141	$ 1,123,727
Installations and services
Sales:
Total sales		68,405	70,081	146,663	147,086
Cost of product
Cost and expenses:
Cost and expenses		466,267	492,334	885,360	766,928
Cost of installations and services
Cost and expenses:
Cost and expenses		$ 68,311	$ 70,136	$ 144,854	$ 144,184

[1] Represents the change in value of unrealized open positions and expired options.