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Stock Incentive Plans - Sumamry of Performance Shares/units Granted (Parenthetical) (Details) - Performance Shares [Member] | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Actual to Target Number of Shares Issued Percentage, Minimum | 0.00% |
Actual to Target Number of Shares Issued Percentage, Maximum | 200.00% |
Target Number of Shares Issued Percentage | 100.00% | 100.00%

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- Definition The maximum percentage of the range of the actual number of shares issued compared to the target shares granted. + References No definition available. + Details
Name: | ash_ActualToTargetNumberOfSharesIssuedPercentageMaximum
Namespace Prefix: | ash_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum percentage of the range of the actual number of shares issued compared to the target shares granted. + References No definition available. + Details
Name: | ash_ActualToTargetNumberOfSharesIssuedPercentageMinimum
Namespace Prefix: | ash_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of the target shares issued during the period. + References No definition available. + Details
Name: | ash_TargetNumberOfSharesIssuedPercentage
Namespace Prefix: | ash_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |