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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Jan. 31, 2022
Feb. 28, 2022
Jul. 31, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol BOX    
Entity Registrant Name Box, Inc.    
Entity Central Index Key 0001372612    
Current Fiscal Year End Date --01-31    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   143,423,689  
Entity Public Float     $ 3.6
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Class A Common Stock, $0.0001 par value per share    
Security Exchange Name NYSE    
Entity File Number 001-36805    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-2714444    
Entity Address, Address Line One 900 Jefferson Ave    
Entity Address, City or Town Redwood City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94063    
City Area Code 877    
Local Phone Number 729-4269    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement relating to the Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended January 31, 2022.

    
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location San Francisco, California