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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Parenthetical) (Details) - shares | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |
Common shares issued | 70,461 | 140,614

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- Definition Reconciliation of changes in stockholders equity stock issued during period shares new issues. + References No definition available. + Details
Name: | ash_ReconciliationOfChangesInStockholdersEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | ash_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration