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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows provided by (used in) operating activities:    
Net income $ 76,955 $ 44,647
Adjustment to reconcile net income to net cash provided by (used in) operating activities:    
(Increase) decrease in the fair value of derivative instruments [1] (7,306) 7,026
Depreciation and amortization 24,419 21,677
Provision for losses on accounts receivable 5,687 2,261
Change in deferred taxes 29,641 4,451
Changes in operating assets and liabilities:    
Increase in receivables (86,504) (40,524)
Decrease in inventories 12,390 3,761
(Increase) decrease in other assets (2,938) 3,443
Increase (decrease) in accounts payable 5,078 (3,468)
Decrease in customer credit balances (36,503) (45,757)
Increase in other current and long-term liabilities 9,100 25,693
Net cash provided by operating activities 30,019 23,210
Cash flows provided by (used in) investing activities:    
Capital expenditures (8,682) (9,348)
Proceeds from sales of fixed assets 325 171
Purchase of investments [2] (34,840) (11,538)
Acquisitions (21,262) (14,504)
Net cash used in investing activities (64,459) (35,219)
Cash flows provided by (used in) financing activities:    
Revolving credit facility borrowings 160,104  
Revolving credit facility repayments (118,604)  
Term loan repayments (7,500) (13,700)
Distributions (19,139) (18,020)
Unit repurchases (22,538)  
Customer retainage payments (918) (575)
Payments of debt issue costs   (60)
Net cash used in financing activities (8,595) (32,355)
Net decrease in cash, cash equivalents, and restricted cash (43,035) (44,364)
Cash, cash equivalents, and restricted cash at beginning of period 52,708 139,188
Cash, cash equivalents, and restricted cash at end of period $ 9,673 $ 94,824
[1] Represents the change in value of unrealized open positions and expired options.
[2] See Note 2 – Captive insurance collateral