Cover - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Feb. 28, 2022	Jul. 31, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2022
Current Fiscal Year End Date	--01-31
Document Transition Report	false
Entity File Number	001-040601
Entity Registrant Name	Couchbase, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-3576987
Entity Address, Address Line One	3250 Olcott Street
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95054
City Area Code	650
Local Phone Number	417-7500
Title of 12(b) Security	Common stock, par value $0.00001 per share
Trading Symbol	BASE
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 719,700
Entity Common Stock, Shares Outstanding		44,171,413
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for the 2022 annual meeting of stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended January 31, 2022
Entity Central Index Key	0001845022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false