Unaudited Consolidated Statements of Changes in Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income	$ 11,559	$ 61,416
Reconciliation of net income to cash flows provided by operating activities:
Depreciation and amortization	54,607	52,514
Write off of Deferred Debt Issuance Cost	0	1,795
Amortization of deferred financing fees (includes $0 and $1,795 write off of deferred financing fees)	1,044	3,103
Deferred income taxes	476	(1,209)
Share-based compensation	6,233	5,984
Loss on sale of property, plant and equipment	807	170
Loss (gain) on sale of business		(68,051)
Foreign currency exchange (gains) losses on intercompany loans and other non-cash items	(3,659)	1,514
Changes in assets and liabilities
Accounts receivable	36,221	7,256
Inventories	(14,091)	(17,800)
Contract assets	6,553	(5,377)
Prepaids and other current assets	(9,921)	(3,715)
Accounts payable	(9,799)	6,004
Accrued expenses and other liabilities	(9,089)	60
Contract liabilities	9,829	(4,920)
Income taxes	(3,948)	2,140
Other non‑current assets and liabilities	(13,955)	(252)
Net cash provided by operating activities	63,058	38,837
Investing activities
Purchase of property, plant and equipment	(36,297)	(38,759)
Purchase of intangibles	(539)	(622)
Proceeds from sale of property, plant and equipment	640	271
Proceeds from sale of business, net of cash of $0 and $12,117		118,894
Acquisitions	(8,743)	(11,164)
Net cash (used in) provided by investing activities	(44,042)	68,620
Financing activities
Issuance of debt, net of deferred issuance costs	13,993	8,212
Borrowings under credit facility	0	2,597
Repayment of debt	(10,036)	(109,333)
Repayment of finance lease obligation	(6,901)	(6,694)
Payment of earn-out related to previous acquisitions	0	(175)
Proceeds from issuance of common stock	13,430	8,333
Taxes paid related to net share settlements of share-based compensation awards	(1,863)	(9,817)
Distribution to non‑controlling interest	(350)	(1,450)
Net cash provided by (used in) financing activities	8,273	(108,327)
Effect of exchange rate changes on cash	2,428	(516)
Change in cash and cash equivalents	29,717	(1,386)
Cash and cash equivalents
Beginning of period	193,001	109,881
End of period	222,718	108,495
Supplemental disclosure of cash flow information
Cash paid for taxes	5,457	2,133
Cash paid for interest	14,647	22,953
Non‑cash investing and financing activities
Finance lease transactions	9,044	4,308
Operating lease transactions	7,993	10,076
Option and Purchase Right	$ 0	$ 7,167