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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