Goodwill - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jul. 01, 2021
Goodwill [Line Items]
Goodwill, impairment loss				$ 9,435,000
Income tax expense (benefit)	$ 10,979,000		$ (16,109,000)	14,196,000	$ (8,563,000)
PIM Reporting Unit
Goodwill [Line Items]
Fair value in excess of carrying value, percent						5.00%
Performance Materials
Goodwill [Line Items]
Goodwill, impairment loss				$ 9,435,000
Performance Materials | PIM
Goodwill [Line Items]
Goodwill, impairment loss			201,550,000
Income tax expense (benefit)			23,539,000
Wood treatment
Goodwill [Line Items]
Goodwill, impairment loss		$ 9,435,000	6,671,000		10,752,000
Income tax expense (benefit)	$ 0		$ 0		$ 0