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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Statement of Cash Flows [Abstract] |  |  |
Net income (loss) | $ 68,676 | $ 40,554 | $ 33,478
Bad debt expense |  | 1,864 | 552
Deferred financing cost amortization | 198 | 152 | 318
Depreciation and amortization | 21,914 | 12,508 | 9,557
Loss (gain) on sale of assets | 47 | 0 | 52
Non-cash compensation | 3,522 | 3,323 | 2,357
Goodwill impairment expense |  | 6,976 | 0
Deferred income taxes | 11,724 | 5,122 | 5,681
Accounts receivable | (55,371) | (25,389) | (35,254)
Inventories | (30,517) | (2,822) | (684)
Costs and estimated earnings in excess of billings | (13,451) | 435 | 1,586
Prepaid expenses and other current assets | (9,226) | (9,355) | (7,171)
Other non-current assets | 703 | 510 | (444)
Accounts payable and accrued expenses | 30,623 | 20,122 | 22,472
Billings in excess of costs and estimated earnings | 6,746 | 13,967 | 6,683
Other non-current liabilities | 1,214 | 8,774 | (459)
Net cash provided by operating activities | 37,924 | 76,741 | 38,724
Purchases of property and equipment | 7,401 | 4,745 | 6,300
Proceeds from sale of assets | 295 | 104 | 502
Cash received (paid) in conjunction with business combinations | 92,463 | 28,952 | 50
Net cash used in investing activities | (99,569) | (33,593) | (5,748)
Borrowings of debt | 1,318,530 | 592,768 | 89,261
Repayments of debt | (1,278,204) | (592,756) | (119,508)
Finance lease payment | (648) | (215) | 0
Payment for Contingent Consideration Liability, Financing Activities | 0 | 0 | (240)
Distribution to noncontrolling interests | (311) | (639) | (240)
Purchase of treasury stock | (7,006) | (7,697) | (9,802)
Issuance of shares | 0 | 34 | 0
Net cash used in financing activities | 31,173 | (8,505) | (40,289)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (30,472) | 34,643 | (7,313)
CASH, CASH EQUIVALENTS and RESTRiCTED CASH, beginning of period | 53,577 | 18,934 | 26,247
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period | 23,105 | 53,577 | 18,934
Cash paid for interest | 738 | 782 | 1,743
Cash paid for income taxes (net) | 5,062 | $ 323 | $ 1,370
Payments for Repurchase of Redeemable Noncontrolling Interest | $ (1,188) |  |

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