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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Jan. 31, 2025
Mar. 20, 2025
Jul. 31, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Trading Symbol AMBA    
Entity Registrant Name AMBARELLA, INC.    
Entity Central Index Key 0001280263    
Current Fiscal Year End Date --01-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   42,437,410  
Entity Public Float     $ 1.6
Entity File Number 001-35667    
Entity Tax Identification Number 98-0459628    
Entity Address, Address Line One 3101 Jay Street    
Entity Address, City or Town Santa Clara    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95054    
City Area Code 408    
Local Phone Number 734-8888    
Entity Incorporation, State or Country Code E9    
Title of 12(b) Security Ordinary Shares, $0.00045 Par Value Per Share    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location San Jose, California    
Auditor Firm ID 238    
Documents Incorporated by Reference

Certain information is incorporated into Part III of this report by reference to the Proxy Statement for the Registrant’s 2025 annual meeting of shareholders to be filed with the Securities and Exchange Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

   
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Ambarella, Inc. and its subsidiaries (the "Company") as of January 31, 2025 and 2024, and the related consolidated statements of operations, of comprehensive loss, of shareholders' equity and of cash flows for each of the three years in the period ended January 31, 2025, including the related notes (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of January 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of January 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended January 31, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of January 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.