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Accrued and Other Current Liabilities - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2024 USD ($)
Schedule of Accrued Liabilities [Line Items] |
Annual bonus paid | $ 4.1
Cash [Member] |
Schedule of Accrued Liabilities [Line Items] |
Annual bonus paid | 1.1
Restricted stock units [Member] |
Schedule of Accrued Liabilities [Line Items] |
Annual bonus paid | $ 3.0

X
- Definition Payments for bonus. + References No definition available. + Details
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Namespace Prefix: | amba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Schedule of accrued liabilities. + References No definition available. + Details
Name: | amba_ScheduleOfAccruedLiabilitiesLineItems
Namespace Prefix: | amba_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |