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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows provided by (used in) operating activities:    
Net income $ 43,413 $ 69,239
Adjustment to reconcile net income to net cash provided by (used in) operating activities:    
(Increase) decrease in fair value of derivative instruments (9,863) (27,167)
Depreciation and amortization 8,117 10,702
Loss on redemption of debt   1,700
Provision for losses on accounts receivable 6,249 7,873
Change in deferred taxes 22,930 37,858
Changes in operating assets and liabilities:    
Increase in receivables (111,154) (213,123)
Decrease in inventories 36,115 27,835
Increase in weather hedge contract receivable (12,500)  
Decrease (increase) in other assets 8,896 (3,431)
Increase (decrease) in accounts payable (4,148) 6,099
Decrease in customer credit balances (36,302) (52,242)
Increase in other current and long-term liabilities 12,487 31,965
Net cash used in operating activities (35,760) (102,692)
Cash flows provided by (used in) investing activities:    
Capital expenditures (2,659) (2,721)
Proceeds from sales of fixed assets 272 68
Acquisitions (26,157) (1,791)
Net cash used in investing activities (28,544) (4,444)
Cash flows provided by (used in) financing activities:    
Revolving credit facility borrowings 86,252 88,416
Revolving credit facility repayments (53,849) (56,823)
Repayment of debt   (82,499)
Proceeds from the issuance of debt   124,188
Debt extinguishment costs   (1,409)
Distributions (9,954) (10,162)
Unit repurchase (19,555)  
Deferred charges (326) (3,817)
Net cash provided by financing activities 2,568 57,894
Net decrease in cash and cash equivalents (61,736) (49,242)
Cash and cash equivalents at beginning of period 86,789 61,062
Cash and cash equivalents at end of period $ 25,053 $ 11,820