XML 60 R51.htm IDEA: XBRL DOCUMENT
v3.22.4

Financial Instruments - Schedule Of Expected Deferred Gains (Losses) Recognition (Details) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Next twelve months | $ 2,120
Thereafter | 91,497
Total | $ 93,617

X
- Definition Cash Flow Hedge Gain (Loss) To Be Reclassified After Twelve Months + References No definition available. + Details
Name: | ato_CashFlowHedgeGainLossToBeReclassifiedAfterTwelveMonths
Namespace Prefix: | ato_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash Flow Hedge Gain (Loss) To Be Reclassified, Total + References No definition available. + Details
Name: | ato_CashFlowHedgeGainLossToBeReclassifiedTotal
Namespace Prefix: | ato_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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