XML 50 R41.htm IDEA: XBRL DOCUMENT v3.22.4

Shareholders' Equity - Forward Sales Agreement (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares available (in shares) | shares	6,598,862
Net proceeds available | $	$ 754,866
Forward price (USD per share) | $ / shares	$ 114.39
Forward Sales Equity Agreement Maturing Quarter Ended September 29, 2023
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares available (in shares) | shares	2,437,669
Net proceeds available | $	$ 271,874
Forward price (USD per share) | $ / shares	$ 111.53
Forward Sales Equity Agreement Maturing Quarter Ended December 29, 2023
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares available (in shares) | shares	919,898
Net proceeds available | $	$ 105,542
Forward price (USD per share) | $ / shares	$ 114.73
Forward Sales Equity Agreement Maturing Quarter Ended March 28, 2024
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares available (in shares) | shares	2,744,502
Net proceeds available | $	$ 318,963
Forward price (USD per share) | $ / shares	$ 116.22
Forward Sales Equity Agreement Maturing Quarter Ended June 28, 2024
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares available (in shares) | shares	496,793
Net proceeds available | $	$ 58,487
Forward price (USD per share) | $ / shares	$ 117.73

X

- Definition

The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=126731327&loc=d3e90205-114008

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(1)
-URI https://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879

+ Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquityForwardRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
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_ForwardContractIndexedToIssuersEquityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount that would be paid upon settlement of forward contract indexed to equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126731327&loc=d3e90205-114008

+ Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquitySettlementAlternativesCashAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of shares as a settlement alternative for each freestanding forward contract.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126731327&loc=d3e90205-114008

+ Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquitySettlementAlternativesSharesAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=ato_ForwardSalesEquityAgreementMaturingQuarterEndedSeptember292023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=ato_ForwardSalesEquityAgreementMaturingQuarterEndedDecember292023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=ato_ForwardSalesEquityAgreementMaturingQuarterEndedMarch282024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=ato_ForwardSalesEquityAgreementMaturingQuarterEndedJune282024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: