CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Cash flows provided by (used in) operating activities:
Net income		$ 81,353	$ 75,580
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	7,278	20,658
Depreciation and amortization		16,633	16,050
Provision for losses on accounts receivable		3,672	4,768
Change in deferred taxes		(2,756)	(12,379)
Change in weather hedge contracts		(7,498)	(12,500)
Changes in operating assets and liabilities:
Increase in receivables		(87,709)	(124,764)
(Increase) decrease in inventorie		(5,473)	11,609
Decrease in other assets		9,708	14,199
Increase (decrease) in accounts payable		2,852	(7,516)
Decrease in customer credit balances		(61,615)	(41,768)
Increase in other current and long-term liabilities		38,376	42,230
Net cash used in operating activities		(5,179)	(13,833)
Cash flows provided by (used in) investing activities:
Capital expenditures		(6,022)	(5,182)
Proceeds from sales of fixed assets		328	539
Proceeds from sale of certain assets		0	2,202
Purchase of investments		(946)	(465)
Acquisitions		(22,577)	(1,193)
Net cash used in investing activities		(29,217)	(4,099)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		79,596	125,601
Revolving credit facility repayments		(50,597)	(75,941)
Term loan repayments		(12,250)	(8,250)
Distributions		(12,234)	(11,505)
Unit repurchases		(2,528)	(4,475)
Customer retainage payments		(719)	(33)
Net cash provided by financing activities		1,268	25,397
Net (decrease) increase in cash, cash equivalents, and restricted cash		(33,128)	7,465
Cash, cash equivalents, and restricted cash at beginning of period		45,441	14,870
Cash, cash equivalents, and restricted cash at end of period		$ 12,313	$ 22,335

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