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Condensed Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sales:    
Product $ 463,387 $ 454,470
Installations and service 57,223 62,055
Total sales 520,610 516,525
Cost and expenses:    
Cost of product 358,577 356,613
Cost of installations and service 53,443 57,221
(Increase) decrease in fair value of derivative instruments (5,458) 7,965
Delivery and branch expenses 68,400 68,387
Depreciation and amortization expenses 4,359 4,358
General and administrative expenses 5,406 4,491
Finance charge income (1,004) (1,088)
Operating income 36,887 18,578
Interest expense, net (3,623) (3,417)
Amortization of debt issuance costs (421) (492)
Income before income taxes 32,843 14,669
Income tax expense 13,555 4,917
Net income 19,288 9,752
General Partner's interest in net income 109 53
Limited Partners' interest in net income $ 19,179 $ 9,699
Basic and diluted income per Limited Partner Unit $ 0.29 [1] $ 0.15 [1]
Weighted average number of Limited Partner units outstanding:    
Basic and Diluted 57,511 60,556
[1] See Note 13 Earnings Per Limited Partner Unit.