Condensed Consolidated Statements of Changes in Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net (loss) income	$ (8,471)	$ 7,884	$ 6,410
Reconciliation of net income to cash flows provided by operating activities:
Depreciation and amortization	98,236	85,860	77,886
Amortization of debt related costs (includes $0, $5,575 and $3,094 write off of deferred financing fees)	2,612	8,073	8,511
Deferred income taxes	1,948	(6,232)	1,273
Share-based compensation	19,903	15,742	2,251
Gain on sale of property, plant and equipment	(932)	(6,750)	1,230
Foreign currency exchange losses (gains) on intercompany loans and other non-cash items	10,713	5,766	(5,625)
Changes in assets and liabilities
Accounts receivable	(13,235)	(3,139)	(44,047)
Inventories	(1,469)	(12,051)	(5,948)
Contract assets	(23,827)	(3,544)	(17,296)
Prepaids and other current assets	9,447	(3,773)	(2,971)
Accounts payable	9,408	24,945	4,707
Accrued expenses and other liabilities	(9,159)	(22,851)	(2,243)
Contract liabilities	21,311	(9,254)	1,301
Income taxes	(3,651)	2,777	6,656
Other non‑current assets and liabilities	12,362	(2,436)	(3,593)
Net cash provided by operating activities	125,196	81,017	28,502
Investing activities
Purchase of property, plant and equipment	(88,869)	(80,713)	(57,775)
Purchase of intangibles	(6,426)	(1,950)	(4,914)
Proceeds from sale of property, plant and equipment	3,636	21,641	5,422
Proceeds from sale of business	0	430	0
Acquisitions, net of cash received of $2,073, $27 and $209	(2,873)	(146,443)	(77,628)
Net cash used in investing activities	(94,532)	(207,035)	(134,895)
Financing activities
Issuance of debt, net of deferred issuance costs	38,381	155,270	415,602
Borrowings under credit facility	292,825	129,000	131,000
Repayment of debt	(307,809)	(242,470)	(423,418)
Repayment of capital lease obligation	(12,900)	(10,474)	(7,962)
Payment of earn-out related to previous acquisitions	(461)	(5,528)	0
Proceeds from issuance of common stock	363	137,605	5,521
Taxes paid related to net share settlements of share-based compensation awards	(1,270)	(8,807)	0
Stock repurchases	0	(230)	(1,474)
Cash paid for interest rate cap	(2,235)	0	0
Distribution to non‑controlling interest	(1,150)	(3,725)	(4,750)
Net cash provided by financing activities	5,744	150,641	114,519
Effect of exchange rate changes on cash	(1,601)	(1,512)	766
Cash and cash equivalents classified as held for sale	(7,291)	0	0
Change in cash and cash equivalents	27,516	23,111	8,892
Cash and cash equivalents
Beginning of period	82,365	59,254	50,362
End of period	109,881	82,365	59,254
Supplemental disclosure of cash flow information
Cash paid for taxes	10,340	4,450	3,017
Cash paid for interest	52,786	43,596	43,426
Non‑cash investing and financing activities
Accrued earn-out related to acquisitions	0	1,570	7,479
Capital lease transactions	18,640	10,595	15,513
Landlord incentives	1,000	0	1,700
Cloud computing related intangible transaction	$ 0	$ 0	$ 5,544