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Discontinued Operations - Additional Information (Details) shares in Millions	7 Months Ended
	May 12, 2017 shares
Discontinued Operations And Disposal Groups [Abstract]
Valvoline Shares Owned by Ashland	170

X

- Definition

The number of Valvoline Inc. shares owned by Ashland after the initial public offering of Valvoline Inc. was completed.

+ References

No definition available.

+ Details

Name:	ash_ValvolineSharesOwnedByAshland
Namespace Prefix:	ash_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration