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Condensed Statements of Operations (Unaudited) (Parentheticals) - shares		6 Months Ended
	Feb. 12, 2025	Jun. 30, 2024
Shares Subject to Forfeiture		750,000
IPO [Member]
Units Issued During Period, Shares	23,000,000	23,000,000
Over-Allotment Option [Member]
Units Issued During Period, Shares	3,000,000	3,000,000

X

- Definition

The number of shares subject to forfeiture.

+ References

No definition available.

+ Details

Name:	atiiu_SharesSubjectToForfeiture
Namespace Prefix:	atiiu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares of units issued during the period.

+ References

No definition available.

+ Details

Name:	atiiu_UnitsIssuedDuringPeriodShares
Namespace Prefix:	atiiu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: