v3.22.4

Cover	Feb. 27, 2023
Document Information [Line Items]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Feb. 27, 2023
Entity File Number	001-40870
Entity Registrant Name	MOUNT RAINIER ACQUISITION CORP.
Entity Central Index Key	0001854461
Entity Tax Identification Number	86-2029991
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	256 W. 38th Street
Entity Address, Address Line Two	15th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10018
City Area Code	212
Local Phone Number	785-4680
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
custom:Units [Member]
Document Information [Line Items]
Title of 12(b) Security	Units
Trading Symbol	RNERU
Security Exchange Name	NASDAQ
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock
Trading Symbol	RNER
Security Exchange Name	NASDAQ
custom:Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Warrants
Trading Symbol	RNERW
Security Exchange Name	NASDAQ

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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Mount Rainier Acquisition Corp. 8-K