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Debt - Summary of Debt Issuance Cost Amortization (Parenthetical) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2017 USD ($)
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Repayment of debt, accelerated accretion	$ 92

X

- Definition

Accelerated accretion of the recorded debt discount due to termination or repayment of debt.

+ References

No definition available.

+ Details

Name:	ash_RepaymentOfDebtAcceleratedAccretion
Namespace Prefix:	ash_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: