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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows provided by (used in) operating activities:    
Net income $ 67,267 $ 91,241
Adjustment to reconcile net income to net cash provided by (used in) operating activities:    
(Increase) decrease in fair value of derivative instruments (8,788) (4,341)
Depreciation and amortization 14,118 13,178
Provision for losses on accounts receivable (448) 3,567
Change in deferred taxes 8,295 7,776
Change in weather hedge contract receivable (12,500)  
Changes in operating assets and liabilities:    
Increase in receivables (37,778) (145,609)
Decrease in inventories 10,243 8,581
(Increase) decrease in other assets (1,889) 192
Increase (decrease) in accounts payable (1,274) 5,624
Decrease in customer credit balances (15,217) (42,309)
Increase in other current and long-term liabilities 52,206 65,700
Net cash provided by operating activities 74,235 3,600
Cash flows provided by (used in) investing activities:    
Capital expenditures (5,482) (3,674)
Proceeds from sales of fixed assets 254 157
Acquisitions (7,615) (1,069)
Net cash used in investing activities (12,843) (4,586)
Cash flows provided by (used in) financing activities:    
Revolving credit facility borrowings   12,296
Revolving credit facility repayments   (12,296)
Repayment of term loan (2,500)  
Distributions (11,102) (10,195)
Unit repurchases (707) (691)
Customer retainage payments (680)  
Payments of debt issuance costs (297)  
Net cash used in financing activities (15,286) (10,886)
Net increase (decrease) in cash and cash equivalents 46,106 (11,872)
Cash and cash equivalents at beginning of period 100,508 48,999
Cash and cash equivalents at end of period $ 146,614 $ 37,127