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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sales:        
Total sales $ 543,063 $ 699,582 $ 1,052,008 $ 1,234,609
Cost and expenses:        
(Increase) decrease in the fair value of derivative instruments [1] 11,670 (13,401) 5,253 17,638
Delivery and branch expenses 85,463 110,684 182,189 213,357
Depreciation and amortization expenses 9,089 7,858 18,139 15,603
General and administrative expenses 5,422 9,849 11,928 17,664
Finance charge income (1,321) (1,443) (2,034) (2,294)
Operating income 86,117 105,002 128,568 111,065
Interest expense, net (2,756) (3,194) (5,435) (5,710)
Amortization of debt issuance costs (253) (244) (488) (503)
Income before income taxes 83,108 101,564 122,645 104,852
Income tax expense 24,700 29,239 36,482 30,212
Net income 58,408 72,325 86,163 74,640
General Partner’s interest in net income 409 454 601 469
Limited Partners’ interest in net income $ 57,999 $ 71,871 $ 85,562 $ 74,171
Basic and diluted income per Limited Partner Unit: [2] $ 1.03 $ 1.15 $ 1.52 $ 1.19
Weighted average number of Limited Partner units outstanding:        
Basic and Diluted 46,244 51,427 46,760 52,174
Product        
Sales:        
Total sales $ 481,275 $ 637,400 $ 913,963 $ 1,096,107
Installations and services        
Sales:        
Total sales 61,788 62,182 138,045 138,502
Cost of product        
Cost and expenses:        
Cost and expenses 285,350 415,639 573,023 721,865
Cost of installations and services        
Cost and expenses:        
Cost and expenses $ 61,273 $ 65,394 $ 134,942 $ 139,711
[1] Represents the change in value of unrealized open positions and expired options.
[2] See Note 16 - Earnings Per Limited Partner Unit.