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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2022 USD ($) lease
Long-term Purchase Commitment [Line Items] |
Lessee, finance lease, not yet commenced, number of service center | lease | 2
Lessee, finance lease, not yet commenced, future payments | $ | $ 48.1
Supply Commitment |
Long-term Purchase Commitment [Line Items] |
Contract term | 1 year

X
- Definition Lessee, Finance Lease, Not Yet Commenced, Future Payments + References No definition available. + Details
Name: | ato_LesseeFinanceLeaseNotYetCommencedFuturePayments
Namespace Prefix: | ato_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Finance Lease, Not Yet Commenced, Number of Service Center + References No definition available. + Details
Name: | ato_LesseeFinanceLeaseNotYetCommencedNumberOfServiceCenter
Namespace Prefix: | ato_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=us-gaap_SupplyCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |