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v3.25.1

Other Long-Term Liabilities - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2025 USD ($)
Other Liabilities Disclosure [Abstract] |
Tax liabilities released due to lapse | $ 2.8

X
- Definition Tax liabilities released due to lapse. + References No definition available. + Details
Name: | amba_TaxLiabilitiesReleasedDueToLapse
Namespace Prefix: | amba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration