CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Sales:
Product		$ 622,962	$ 475,485	$ 989,696	$ 791,776
Installations and services		61,069	56,567	131,169	124,394
Total sales		684,031	532,052	1,120,865	916,170
Cost and expenses:
Cost of product		403,293	288,941	646,073	488,534
Cost of installations and services		64,659	58,426	134,214	124,913
(Increase) decrease in the fair value of derivative instruments	[1]	11,609	12,442	209	3,891
Delivery and branch expenses		106,605	92,214	197,809	173,347
Depreciation and amortization expenses		7,703	6,726	15,444	13,287
General and administrative expenses		6,221	5,556	12,872	11,909
Finance charge income		(1,532)	(1,285)	(2,295)	(1,980)
Operating income		85,473	69,032	116,539	102,269
Interest expense, net		(2,383)	(1,712)	(4,470)	(3,499)
Amortization of debt issuance costs		(307)	(324)	(616)	(636)
Income before income taxes		82,783	66,996	111,453	98,134
Income tax expense		28,005	27,292	26,493	40,155
Net income		54,778	39,704	84,960	57,979
General Partner’s interest in net income		319	233	494	338
Limited Partners’ interest in net income		$ 54,459	$ 39,471	$ 84,466	$ 57,641
Basic and diluted income per Limited Partner Unit	[2]	$ 0.81	$ 0.59	$ 1.26	$ 0.87
Weighted average number of Limited Partner units outstanding:
Basic and Diluted		55,642	55,888	55,766	55,888

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

[2] See Note 13 - Earnings Per Limited Partner Unit.