CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Sales:
Total sales		$ 604,115	$ 543,063	$ 977,435	$ 1,052,008
Cost and expenses:
(Increase) decrease in the fair value of derivative instruments	[1]	(8,224)	11,670	(25,619)	5,253
Delivery and branch expenses		100,942	85,463	181,629	182,189
Depreciation and amortization expenses		8,268	9,089	16,225	18,139
General and administrative expenses		6,320	5,422	12,561	11,928
Finance charge income		(799)	(1,321)	(1,205)	(2,034)
Operating income		119,695	86,117	174,481	128,568
Interest expense, net		(2,136)	(2,756)	(3,987)	(5,435)
Amortization of debt issuance costs		(243)	(253)	(490)	(488)
Income before income taxes		117,316	83,108	170,004	122,645
Income tax expense		32,152	24,700	46,980	36,482
Net income		85,164	58,408	123,024	86,163
General Partner’s interest in net income		681	409	977	601
Limited Partners’ interest in net income		$ 84,483	$ 57,999	$ 122,047	$ 85,562
Basic and diluted income per Limited Partner Unit:	[2]	$ 1.71	$ 1.03	$ 2.43	$ 1.52
Weighted average number of Limited Partner units outstanding:
Basic and Diluted		40,382	46,244	41,324	46,760
Product
Sales:
Total sales		$ 539,371	$ 481,275	$ 839,703	$ 913,963
Installations and services
Sales:
Total sales		64,744	61,788	137,732	138,045
Cost of product
Cost and expenses:
Cost and expenses		313,552	285,350	485,699	573,023
Cost of installations and services
Cost and expenses:
Cost and expenses		$ 64,361	$ 61,273	$ 133,664	$ 134,942

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

[2] See Note 16 - Earnings Per Limited Partner Unit.