CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Cash flows provided by (used in) operating activities:
Net income		$ 75,580	$ 95,868
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	20,658	(4,212)
Depreciation and amortization		16,050	17,005
Provision for losses on accounts receivable		4,768	2,167
Change in deferred taxes		(12,379)	4,545
Change in weather hedge contracts		(12,500)	(1,087)
Changes in operating assets and liabilities:
Increase in receivables		(124,764)	(165,063)
Decrease (increase) in inventories		11,609	(18,048)
Decrease (increase) in other assets		14,199	(41,314)
(Decrease) increase in accounts payable		(7,516)	16,434
Decrease in customer credit balances		(41,768)	(50,913)
Increase in other current and long-term liabilities		42,230	39,177
Net cash used in operating activities		(13,833)	(105,441)
Cash flows provided by (used in) investing activities:
Capital expenditures		(5,182)	(7,128)
Proceeds from sales of fixed assets		539	530
Proceeds from sale of certain assets		2,202
Purchase of investments		(465)	(369)
Acquisitions		(1,193)	(6,536)
Net cash used in investing activities		(4,099)	(13,503)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		125,601	200,177
Revolving credit facility repayments		(75,941)	(23,072)
Term loan repayments		(8,250)	(11,365)
Distributions		(11,505)	(11,432)
Unit repurchases		(4,475)	(22,182)
Customer retainage payments		(33)	(267)
Net cash provided by financing activities		25,397	131,859
Net increase in cash, cash equivalents, and restricted cash		7,465	12,915
Cash, cash equivalents, and restricted cash at beginning of period		14,870	5,017
Cash, cash equivalents, and restricted cash at end of period		$ 22,335	$ 17,932

[1] Represents the change in value of unrealized open positions and expired options.