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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Cash flows provided by (used in) operating activities:      
Net income $ 55,918 $ 17,637 $ 55,505
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
(Increase) decrease in the fair value of derivative instruments [1] 2,755 25,113 (11,408)
Depreciation and amortization 35,622 33,933 32,863
Provision for losses on accounts receivable 3,441 9,541 6,283
Change in deferred taxes (3,544) (5,126) 14,685
Other (income) loss, net 5,724   (7,043)
Changes in operating assets and liabilities net of amounts related to acquisitions:      
Decrease (increase) in receivables 34,366 10,137 (37,149)
Decrease (increase) in inventories 14,588 (6,306) 4,177
Decrease (increase) in other assets 11,627 10,146 (11,924)
(Decrease) increase in accounts payable (3,199) (2,918) 9,703
Increase (decrease) in customer credit balances 14,775 3,615 (6,563)
Increase in other current and long-term liabilities 3,595 1,610 8,331
Net cash provided by operating activities 175,668 97,382 57,460
Cash flows provided by (used in) investing activities:      
Capital expenditures (14,127) (11,301) (13,590)
Proceeds from sales of fixed assets 631 1,097 503
Proceeds from sale of security business     6,824
Purchase of investments (10,417) (11,058) (35,242)
Acquisitions (4,228) (60,904) (23,747)
Net cash used in investing activities (28,141) (82,166) (65,252)
Cash flows provided by (used in) financing activities:      
Revolving credit facility borrowings 90,202 139,331 161,604
Revolving credit facility repayments (151,702) (79,331) (160,104)
Proceeds from term loan 130,000   100,000
Loan repayments (99,000) (7,500) (76,300)
Distributions (24,451) (25,593) (25,603)
Unit repurchases (38,431) (51,353) (26,714)
Customer retainage payments (514) (357) (918)
Payments of debt issuance costs (1,619) (45) (2,100)
Net cash used in financing activities (95,515) (24,848) (30,135)
Net increase (decrease) in cash, cash equivalents and restricted cash 52,012 (9,632) (37,927)
Cash, cash equivalents and restricted cash at beginning of period 5,149 14,781 52,708
Cash, cash equivalents and restricted cash at end of period $ 57,161 $ 5,149 $ 14,781
[1] Represents the change in value of unrealized open positions and expired options.