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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Sales:        
Product $ 584,208 $ 686,452 $ 990,877 $ 1,091,420
Installations and service 45,384 45,413 100,189 99,946
Total sales 629,592 731,865 1,091,066 1,191,366
Cost and expenses:        
Cost of product 459,224 519,154 775,897 820,826
Cost of installations and service 44,374 46,075 96,725 98,697
(Increase) decrease in the fair value of derivative instruments (16,981) (13,261) (9,863) (27,167)
Delivery and branch expenses 61,713 81,975 129,470 147,936
Depreciation and amortization expenses 3,829 4,699 7,458 9,276
General and administrative expenses 4,554 5,264 9,919 10,188
Operating income 72,879 87,959 81,460 131,610
Interest expense (3,829) (4,319) (7,281) (8,539)
Interest income 1,208 1,241 1,936 1,773
Amortization of debt issuance costs (385) (732) (659) (1,426)
Loss on redemption of debt       (1,700)
Income before income taxes 69,873 84,149 75,456 121,718
Income tax expense 29,391 35,468 32,043 52,479
Net income 40,482 48,681 43,413 69,239
General Partner's interest in net income 213 236 228 335
Limited Partners' interest in net income $ 40,269 $ 48,445 $ 43,185 $ 68,904
Basic and Diluted income per Limited Partner Unit (1) $ 0.55 [1] $ 0.61 [1] $ 0.59 [1] $ 0.86 [1]
Weighted average number of Limited Partner units outstanding: Basic and Diluted 61,474 67,078 62,839 67,078
[1] See Note 3 Summary of Significant Accounting Policies - Net Income (Loss) per Limited Partner Unit.