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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sales:        
Product $ 181,751 $ 198,450 $ 1,172,628 $ 1,289,870
Installations and service 50,725 48,322 150,914 148,268
Total sales 232,476 246,772 1,323,542 1,438,138
Cost and expenses:        
Cost of product 146,034 154,379 921,931 975,205
Cost of installations and service 39,892 40,760 136,617 139,457
(Increase) decrease in the fair value of derivative instruments 11,225 16,323 1,362 (10,844)
Delivery and branch expenses 46,760 53,828 176,230 201,764
Depreciation and amortization expenses 4,608 4,420 12,066 13,696
General and administrative expenses 4,008 5,328 13,927 15,516
Operating income (loss) (20,051) (28,266) 61,409 103,344
Interest expense (3,435) (3,918) (10,716) (12,457)
Interest income 1,538 2,018 3,474 3,791
Amortization of debt issuance costs (486) (618) (1,145) (2,044)
Loss on redemption of debt       (1,700)
Income (loss) before income taxes (22,434) (30,784) 53,022 90,934
Income tax expense (benefit) (10,645) (12,587) 21,398 39,892
Net income (loss) (11,789) (18,197) 31,624 51,042
General Partner's interest in net income (loss) (62) (88) 166 247
Limited Partners' interest in net income (loss) $ (11,727) $ (18,109) $ 31,458 $ 50,795
Basic and Diluted income (loss) per Limited Partner Unit (1) (0.19) [1] (0.27) [1] 0.46 [1] 0.66 [1]
Weighted average number of Limited Partner units outstanding: Basic and Diluted 61,024 67,078 62,236 67,078
[1] See Note 3 Summary of Significant Accounting Policies - Net Income (Loss) per Limited Partner Unit.