CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Cash flows provided by (used in) operating activities:
Net income		$ 86,117	$ 51,542
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	1,974	19,268
Depreciation and amortization		27,315	24,584
Provision for losses on accounts receivable		4,556	8,500
Change in deferred taxes		(1,154)	(11,206)
Changes in operating assets and liabilities:
Decrease (increase) in receivables		4,745	(34,793)
Decrease in inventories		21,135	1,958
Decrease in other assets		12,037	9,156
Decrease in accounts payable		(8,229)	(7,570)
Decrease in customer credit balances		(18,537)	(26,177)
Increase in other current and long-term liabilities		26,338	27,060
Net cash provided by operating activities		156,297	62,322
Cash flows provided by (used in) investing activities:
Capital expenditures		(8,573)	(8,235)
Proceeds from sales of fixed assets		395	1,040
Purchase of investments		(10,044)	(10,576)
Acquisitions		(496)	(62,807)
Net cash used in investing activities		(18,718)	(80,578)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		90,202	139,331
Revolving credit facility repayments		(151,702)	(70,331)
Loan issuance		130,000
Term loan repayments		(95,750)	(5,000)
Distributions		(18,389)	(19,208)
Unit repurchases		(27,988)	(34,948)
Customer retainage payments		(514)	(357)
Payments of debt issue costs		(1,619)	(45)
Net cash (used in) provided by financing activities		(75,760)	9,442
Net increase (decrease) in cash, cash equivalents, and restricted cash		61,819	(8,814)
Cash, cash equivalents, and restricted cash at beginning of period		5,149	14,781
Cash, cash equivalents, and restricted cash at end of period		$ 66,968	$ 5,967

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