Consolidated Statements of Operations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Sales:
Product	$ 1,295,374		$ 1,392,871		$ 1,028,423
Installations and service	202,214		198,439		184,353
Total sales	1,497,588		1,591,310		1,212,776
Cost and expenses:
Cost of product	1,024,071		1,057,783		734,594
Cost of installations and service	175,740		179,558		169,453
(Increase) decrease in the fair value of derivative instruments	(8,549)		2,567		(5,622)
Delivery and branch expenses	217,376		250,762		218,625
Depreciation and amortization expenses	16,395		17,884		15,745
General and administrative expenses	18,689		20,709		21,397
Operating income	53,866		62,047		58,584
Interest expense	(14,110)		(15,710)		(14,326)
Interest income	4,443		4,870		3,506
Amortization of debt issuance costs	(1,634)		(2,440)		(2,680)
Loss on redemption of debt			(1,700)		(1,132)
Income before income taxes	42,565		47,067		43,952
Income tax expense	16,576		22,723		15,632
Net income	25,989		24,344		28,320
General Partner's interest in net income	136		115		128
Limited Partners' interest in net income	$ 25,853		$ 24,229		$ 28,192
Basic and diluted income per Limited Partner Unit (1):	0.40	[1]	0.35	[1]	0.38	[1]
Weighted average number of Limited Partner units outstanding: Basic and Diluted	61,931		66,822		70,019

[1] See Note 17 Earnings Per Limited Partner Units.