Segment Information - Reconciliation of Adjusted EBITDA to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Acquisition and divestiture related items	$ (194)		$ (13,701)		$ (1,312)	$ (14,278)
Strategic initiatives and other items	(6,394)		(5,373)		(21,644)	(5,988)
Gain (loss) on divestitures, net	(3,945)		(2,072)		109,264	(2,072)
Highly inflationary accounting losses (primarily non-cash)	0		(520)		(16)	(711)
Stock-based compensation	(5,136)		(6,018)		(9,543)	(10,997)
Non-service pension and postretirement expense	(75)		(133)		(113)	(266)
Depreciation and amortization *	(11,508)		(18,231)		(24,204)	(40,735)
Interest expense, including RPA and factoring financing fees	(10,424)		(17,010)		(25,725)	(33,864)
Loss on debt extinguishment	(16,343)		0		(16,343)	0
Propelis depreciation, amortization, interest and other items	(18,776)		0		(33,979)	0
(Loss) income before income taxes	(28,051)		(11,644)		56,367	(17,474)
Income tax benefit (provision)	6,217		2,728		(34,572)	5,086
Net (loss) income	(21,834)	$ 43,629	(8,916)	$ (3,472)	21,795	(12,388)
Expenses related to dispute	2,175		1,757		11,172	8,624
Cost related to shareholder defense fees			4,538			4,902
Gain on sale of property and other assets						8,655
Loss recovery			1,170
RPA and factoring financing fees	382		1,145		1,050	2,317
Restructuring costs	782		(2,471)		2,305	(1,305)
Brand Solutions
Segment Reporting Information [Line Items]
Gain (loss) on divestitures, net	(3,945)		(2,072)
Corporate and Non-Operating
Segment Reporting Information [Line Items]
Reportable Segments Adjusted EBITDA	(10,389)		(15,262)		(22,336)	(25,975)
Depreciation and amortization *	(501)		(699)		(963)	(1,467)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges (income)	3,560		16,056		6,013	11,112
Memorialization | Reportable Segments
Segment Reporting Information [Line Items]
Reportable Segments Adjusted EBITDA	48,831		45,038		87,780	81,650
Depreciation and amortization *	(8,041)		(7,170)		(16,188)	(14,372)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges (income)	380		2,410		449	3,713
Industrial Technologies | Reportable Segments
Segment Reporting Information [Line Items]
Reportable Segments Adjusted EBITDA	(3,313)		6,042		(7,771)	7,874
Depreciation and amortization *	(2,966)		(5,644)		(6,444)	(11,318)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges (income)	2,739		192		13,092	4,311
Brand Solutions | Reportable Segments
Segment Reporting Information [Line Items]
Reportable Segments Adjusted EBITDA	9,615		15,596		22,309	27,888
Depreciation and amortization *	0		(4,718)		(609)	(13,578)
Acquisition costs, ERP integration costs, and strategic initiatives and other charges (income)	(91)		416		3,402	1,130
Reportable Segments Total | Reportable Segments
Segment Reporting Information [Line Items]
Reportable Segments Adjusted EBITDA	55,133		66,676		102,318	117,412
Depreciation and amortization *	$ (11,007)		$ (17,532)		$ (23,241)	$ (39,268)