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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows provided by (used in) operating activities:    
Net income $ 57,979 $ 67,267
Adjustment to reconcile net income to net cash provided by (used in) operating activities:    
(Increase) decrease in fair value of derivative instruments 3,891 (8,788)
Depreciation and amortization 13,923 14,118
Provision (recovery) for losses on accounts receivable 1,525 (448)
Change in deferred taxes 7,121 8,295
Change in weather hedge contract receivable   (12,500)
Changes in operating assets and liabilities:    
Increase in receivables (111,631) (37,778)
Decrease in inventories 642 10,243
(Increase) decrease in other assets 796 (1,889)
Increase (decrease) in accounts payable 6,797 (1,274)
Decrease in customer credit balances (53,873) (15,217)
Increase in other current and long-term liabilities 36,954 52,206
Net cash provided by (used in) operating activities (35,876) 74,235
Cash flows provided by (used in) investing activities:    
Capital expenditures (7,786) (5,482)
Proceeds from sales of fixed assets 132 254
Purchase of investments [1] (11,474)  
Acquisitions (7,651) (7,615)
Net cash used in investing activities (26,779) (12,843)
Cash flows used in financing activities:    
Term loan repayment (11,200) (2,500)
Distributions (11,719) (11,102)
Unit repurchases   (707)
Customer retainage payments (409) (680)
Payments of debt issue costs (60) (297)
Net cash used in financing activities (23,388) (15,286)
Net (decrease) increase in cash, cash equivalents, and restricted cash (86,043) 46,106
Cash, cash equivalents, and restricted cash at beginning of period 139,188 100,508
Cash, cash equivalents, and restricted cash at end of period $ 53,145 $ 146,614
[1] See Note 2 - Investments