CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Cash flows provided by (used in) operating activities:
Net income		$ 118,795	$ 81,353
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in fair value of derivative instruments	[1]	(11,359)	7,278
Depreciation and amortization		17,345	16,633
Provision for losses on accounts receivable		3,169	3,672
Change in deferred taxes		11,404	(2,756)
Change in weather hedge contracts		3,108	(7,498)
Changes in operating assets and liabilities:
Increase in receivables		(124,722)	(87,709)
Increase in inventories		(22,150)	(5,473)
(Increase) decrease in other assets		(8,826)	9,708
Increase in accounts payable		14,539	2,852
Decrease in customer credit balances		(61,400)	(61,615)
Increase in other current and long-term liabilities		44,138	38,376
Net cash used in operating activities		(15,959)	(5,179)
Cash flows provided by (used in) investing activities:
Capital expenditures		(6,526)	(6,022)
Proceeds from sales of fixed assets		391	328
Proceeds from sale of certain assets		282	0
Purchase of investments		(999)	(946)
Acquisitions		(79,555)	(22,577)
Net cash used in investing activities		(86,407)	(29,217)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		75,359	79,596
Revolving credit facility repayments		(53,016)	(50,597)
Term loan repayments		(5,250)	(12,250)
Distributions		(12,664)	(12,234)
Unit repurchases		(212)	(2,528)
Customer retainage payments		(443)	(719)
Payments of debt issue costs		(241)	0
Net cash provided by financing activities		3,533	1,268
Net decrease in cash, cash equivalents, and restricted cash		(98,833)	(33,128)
Cash, cash equivalents, and restricted cash at beginning of period		117,585	45,441
Cash, cash equivalents, and restricted cash at end of period		$ 18,752	$ 12,313

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