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Leasing Arrangements - Components of Lease Cost Recognized (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2024
Leases [Abstract]
Lease termination fee	$ 0	$ 1

X

- Definition

Lease Termination Fee.

+ References

No definition available.

+ Details

Name:	ash_LeaseTerminationFee
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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