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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sales:      
Product $ 1,065,076 $ 911,014 $ 1,431,585
Installations and services 258,479 250,324 242,706
Total sales 1,323,555 1,161,338 1,674,291
Cost and expenses:      
Cost of product 675,386 539,831 977,631
Cost of installations and services 239,670 229,010 225,957
(Increase) decrease in fair value of derivative instruments [1] (2,193) (18,217) 4,187
Delivery and branch expenses 306,534 276,493 309,025
Depreciation and amortization expenses 27,882 26,530 24,930
General and administrative expenses 24,998 23,366 25,908
Multiemployer pension plan withdrawal charge     17,796
Finance charge income (4,054) (3,079) (4,756)
Operating income (loss) 55,332 87,404 93,613
Interest expense, net (6,775) (7,485) (14,059)
Amortization of debt issuance costs (1,281) (1,247) (1,818)
Loss on redemption of debt     (7,345)
Income before income taxes 47,276 78,672 70,391
Income tax expense 20,376 33,738 32,835
Net income 26,900 44,934 37,556
General Partner's interest in net income 156 252 212
Limited Partners' interest in net income $ 26,744 $ 44,682 $ 37,344
Basic and diluted income per Limited Partner Unit [2] $ 0.46 [3] $ 0.70 [3] $ 0.59
Weighted average number of Limited Partner units outstanding:      
Basic and Diluted 55,888 57,022 57,285
[1] Represents the change in value of unrealized open positions and expired options.
[2] See Note 17 - Earnings Per Limited Partner Units.
[3] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.