CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Cash flows provided by (used in) operating activities:
Net income		$ 123,024	$ 86,163
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	(25,619)	5,253
Depreciation and amortization		16,715	18,627
Provision for losses on accounts receivable		256	3,203
Change in deferred taxes		12,623	222
Change in weather hedge contracts		(3,424)	(10,053)
Changes in operating assets and liabilities:
Increase in receivables		(103,987)	(69,562)
(Increase) decrease in inventories		(9,652)	12,008
(Increase) decrease in other assets		(2,016)	4,812
Increase (decrease) in accounts payable		5,538	(8,910)
Decrease in customer credit balances		(43,421)	(32,462)
Increase in other current and long-term liabilities		35,436	41,574
Net cash provided by operating activities		5,473	50,875
Cash flows provided by (used in) investing activities:
Capital expenditures		(7,232)	(5,684)
Proceeds from sales of fixed assets		143	201
Proceeds from sale of propane assets		6,093
Purchase of investments		(603)	(7,218)
Acquisitions		(38,363)	(496)
Net cash used in investing activities		(39,962)	(13,197)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		75,154	90,202
Revolving credit facility repayments		(40,154)	(127,659)
Loan issuance			130,000
Term loan repayments		(6,500)	(92,500)
Distributions		(11,533)	(12,153)
Unit repurchases		(30,466)	(18,575)
Customer retainage payments		(29)	(300)
Payments of debt issue costs		(11)	(1,291)
Net cash used in financing activities		(13,539)	(32,276)
Net (decrease) increase in cash, cash equivalents, and restricted cash		(48,028)	5,402
Cash, cash equivalents, and restricted cash at beginning of period		57,161	5,149
Cash, cash equivalents, and restricted cash at end of period		$ 9,133	$ 10,551

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