v3.26.1

Cover	Mar. 24, 2026
Document Information [Line Items]
Document Type	S-1
Amendment Flag	false
Entity Information [Line Items]
Entity Registrant Name	Research Alliance Corporation III
Entity Central Index Key	0002118032
Entity Primary SIC Number	6770
Entity Tax Identification Number	98-1918931
Entity Incorporation, State or Country Code	E9
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	600 Fifth Avenue, 23rd Floor
Entity Address, Address Line Two	New York
Entity Address, City or Town	NY
Entity Address, Postal Zip Code	10020
Entity Phone Fax Numbers [Line Items]
City Area Code	617
Local Phone Number	778 2500
Business Contact [Member]
Entity Contact Personnel [Line Items]
Contact Personnel Name	Matthew Hammond
Entity Address, Address Line One	600 Fifth Avenue, 23rd Floor
Entity Address, Address Line Two	New York
Entity Address, City or Town	NY
Entity Address, Postal Zip Code	10020
Entity Phone Fax Numbers [Line Items]
City Area Code	617
Local Phone Number	778 2500

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

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Area code of city

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Name of contact personnel

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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.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Address Line 1 such as Attn, Building Name, Street Name

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Address Line 2 such as Street or Suite number

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Name of the City or Town

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

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Indicate if registrant meets the emerging growth company criteria.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Two-character EDGAR code representing the state or country of incorporation.

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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.

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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.

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Primary Standard Industrial Classification (SIC) Number for the Entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Indicates that the company is a Smaller Reporting Company (SRC).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Local phone number for entity.

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Research Alliance Corp III S-1