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v3.25.1

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