Unaudited Consolidated Statements of Changes in Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 6,477	$ 53,506
Reconciliation of net income to cash flows provided by operating activities:
Depreciation and amortization	27,391	25,143
Amortization of deferred financing fees	526	701
Deferred income taxes	258	(679)
Share-based compensation	3,019	3,680
Loss on sale of property, plant and equipment	19	173
Gain on sale of business	0	(58,279)
Foreign currency exchange gains on intercompany loans and other non-cash items	(6,459)	(6,086)
Changes in assets and liabilities
Accounts receivable	18,083	11,087
Inventories	(11,551)	(14,613)
Contract assets	21,458	3,042
Prepaids and other current assets	(465)	(631)
Accounts payable	(12,652)	(11,056)
Accrued expenses and other liabilities	(32,356)	(9,378)
Contract liabilities	8,010	4,651
Income taxes	(1,271)	1,388
Other non‑current assets and liabilities	(4,873)	2,083
Net cash provided by operating activities	15,614	4,732
Investing activities
Purchase of property, plant and equipment	(17,260)	(17,572)
Purchase of intangibles	(81)	(210)
Proceeds from sale of property, plant and equipment	127	251
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	108,921
Acquisitions	(8,743)	(11,160)
Net cash (used in) provided by investing activities	(25,957)	80,230
Financing activities
Issuance of debt, net of deferred issuance costs	7,805	3,532
Borrowings under credit facility	0	13
Repayment of debt	(5,723)	(3,793)
Repayment of finance lease obligation	(3,821)	(4,162)
Payment of earn-out related to previous acquisitions	0	(175)
Proceeds from issuance of common stock	14,263	4,046
Distribution to non‑controlling interest	(250)	(1,250)
Net cash provided by (used in) financing activities	12,274	(1,789)
Effect of exchange rate changes on cash	2,988	1,849
Change in cash and cash equivalents	4,919	85,022
Cash and cash equivalents
Beginning of period	193,001	109,881
End of period	197,920	194,903
Supplemental disclosure of cash flow information
Cash paid for taxes	1,334	1,382
Cash paid for interest	7,624	12,268
Non‑cash investing and financing activities
Finance lease transactions	5,484	1,782
Operating lease transactions	5,954	4,734
Option and Purchase Right		7,673
Cash divested with sale of business	$ 0	$ 12,117