Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid‑in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings (Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, outstanding (in shares)		116,008,000
Stockholders' equity, balance at the beginning of the period at Sep. 30, 2019	$ 365,822	$ 1,154	$ (2,837)	$ 552,422	$ (174,976)	$ (13,004)	$ 3,063	$ (1,337)	$ (1,337)
Treasury stock, balance at the beginning of the period (shares) at Sep. 30, 2019			1,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation expense	10,509			10,509
Issuance of common stock (shares)		3,478,000	531,000
Issuance of common stock, net	18,927	$ 35		18,892
Dividends paid to non-controlling interest	(1,890)						(1,890)
Divestiture of Memcor product line	(16,895)			(16,895)
Net income	114,395				113,649		746
Other comprehensive loss	(7,468)					(7,468)
Common stock, ending balance (in shares) at Sep. 30, 2020		119,486,000
Stockholders' equity, balance at the end of the period at Sep. 30, 2020	482,063	$ 1,189	$ (2,837)	564,928	(62,664)	(20,472)	1,919
Treasury stock, balance at the end of the period (shares) at Sep. 30, 2020			2,195,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, outstanding (in shares)		119,486,000
Equity based compensation expense	15,524			15,524
Issuance of common stock (shares)		2,687,000	(531,000)
Issuance of common stock, net	1,634	$ 34		1,600
Dividends paid to non-controlling interest	(551)						(551)
Net income	51,662				51,482		180
Other comprehensive loss	$ 31,887					31,887
Common stock, ending balance (in shares) at Sep. 30, 2021	120,509,000	122,173,000
Stockholders' equity, balance at the end of the period at Sep. 30, 2021	$ 582,219	$ 1,223	$ (2,837)	582,052	(11,182)	11,415	1,548
Treasury stock, balance at the end of the period (shares) at Sep. 30, 2021	1,664,000		1,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, outstanding (in shares)	120,509,000	122,173,000
Equity based compensation expense				22,104
Issuance of common stock (shares)		1,238,000	0
Issuance of common stock, net	$ 3,604	$ 12		3,592
Dividends paid to non-controlling interest	(100)						(100)
Net income	72,343				72,198		145
Other comprehensive loss	$ 31,516					31,516
Common stock, ending balance (in shares) at Sep. 30, 2022	121,747,000	123,411,000
Stockholders' equity, balance at the end of the period at Sep. 30, 2022	$ 710,093	$ 1,235	$ (2,837)	$ 607,748	$ 61,016	$ 42,931	0
Treasury stock, balance at the end of the period (shares) at Sep. 30, 2022	1,664,000		1,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ (1,593)						$ (1,593)
Common stock, outstanding (in shares)	121,747,000	123,411,000