CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash flows provided by (used in) operating activities:
Net income		$ 84,960	$ 57,979
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	209	3,891
Depreciation and amortization		16,060	13,923
Provision for losses on accounts receivable		3,465	1,525
Change in deferred taxes		27,254	7,121
Changes in operating assets and liabilities:
Increase in receivables		(170,530)	(111,631)
(Increase) decrease in inventories		(108)	642
(Increase) decrease in other assets		(4,486)	796
Increase in accounts payable		8,118	6,797
Decrease in customer credit balances		(42,184)	(53,873)
Increase in other current and long-term liabilities		16,967	36,954
Net cash used in operating activities		(60,275)	(35,876)
Cash flows provided by (used in) investing activities:
Capital expenditures		(6,583)	(7,786)
Proceeds from sales of fixed assets		132	132
Purchase of investments	[2]	(34,542)	(11,474)
Acquisitions		(224)	(7,651)
Net cash used in investing activities		(41,217)	(26,779)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		160,104
Revolving credit facility repayments		(45,102)
Term loan repayments		(5,000)	(11,200)
Distributions		(12,604)	(11,719)
Unit repurchases		(12,023)
Customer retainage payments		(912)	(409)
Payments of debt issue costs			(60)
Net cash provided by (used in) financing activities		84,463	(23,388)
Net decrease in cash, cash equivalents, and restricted cash		(17,029)	(86,043)
Cash, cash equivalents, and restricted cash at beginning of period		52,708	139,188
Cash, cash equivalents, and restricted cash at end of period		$ 35,679	$ 53,145

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

[2] See Note 2 – Captive insurance collateral