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Stock Incentive Plans - Sumamry of Performance Shares/units Granted (Parenthetical) (Details) - Performance Shares [Member]	12 Months Ended
	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%

X

- 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: