Restructuring and Impairment Costs - Narrative (Details) employee in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($) employee plant	Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated to date | employee	13
Number of positions eliminated | employee	11
Number of plants expected to close | plant	26
Number of plants closed | plant	22
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 7
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 11
Restructuring charges	$ 11