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Litigation, Claims and Contingencies - Summary of Asbestos Claims Activity (Details) - Claim Claim in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Ashland [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of year	53	54	57
New claims filed	2	2	2
Claims settled	(1)	(1)	(1)
Claims dismissed	(1)	(2)	(4)
Open claims - end of year	53	53	54
Hercules [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of year	13	12	15
New claims filed	1	2	1
Claims dismissed	(1)	(1)	(4)
Open claims - end of year	13	13	12