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Litigation, Claims and Contingencies - Summary of Asbestos Claims Activity (Details) - Claim Claim in Thousands	9 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Ashland [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of year	54	57	57	60	65
New claims filed	2	2	2	2	2
Claims settled	(1)	(1)	(1)	0	0
Claims dismissed	(2)	(3)	(4)	(5)	(7)
Open claims - end of period	53	55	54	57	60
Hercules [Member]
Asbestos claims [Roll Forward]
Open claims - beginning of year	12	15	15	20	21
New claims filed	1	1	1	1	1
Claims dismissed	(1)	(4)	(4)	(6)	(2)
Open claims - end of period	12	12	12	15	20