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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Sales:        
Product $ 732,949 $ 584,208 $ 1,187,419 $ 990,877
Installations and service 52,190 45,384 114,245 100,189
Total sales 785,139 629,592 1,301,664 1,091,066
Cost and expenses:        
Cost of product 571,790 459,224 928,403 775,897
Cost of installations and service 51,338 44,374 108,559 96,725
(Increase) decrease in the fair value of derivative instruments (3,447) (16,981) 4,518 (9,863)
Delivery and branch expenses 83,322 61,713 151,709 129,470
Depreciation and amortization expenses 4,321 3,829 8,679 7,458
General and administrative expenses 4,761 4,554 9,252 9,919
Operating income 73,054 72,879 90,544 81,460
Interest expense (4,024) (3,829) (7,451) (7,281)
Interest income 2,184 1,208 3,282 1,936
Amortization of debt issuance costs (418) (385) (910) (659)
Income before income taxes 70,796 69,873 85,465 75,456
Income tax expense 29,117 29,391 34,034 32,043
Net income 41,679 40,482 51,431 43,413
General Partner's interest in net income 225 213 278 228
Limited Partners' interest in net income $ 41,454 $ 40,269 $ 51,153 $ 43,185
Basic and Diluted income per Limited Partner Unit 0.58 [1] 0.55 [1] 0.72 [1] 0.59 [1]
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 59,837 61,474 60,192 62,839
[1] See Note 13 - Earnings (Loss) Per Limited Partner Unit.