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v3.25.2

Accrued and Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2025 | Jul. 31, 2025 | Jan. 31, 2025
Schedule of Accrued Liabilities [Line Items] |  |  |
Annual bonus paid | $ 9,800 |  |
Development deposit liability |  | $ 13,500 | $ 13,500
Cash [Member] |  |  |
Schedule of Accrued Liabilities [Line Items] |  |  |
Annual bonus paid | 3,700 |  |
Restricted stock units [Member] |  |  |
Schedule of Accrued Liabilities [Line Items] |  |  |
Annual bonus paid | $ 6,100 |  |

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- 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

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- 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

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- Definition The current portion, due within one year or one operating cycle, if longer, of deposits held other than customer deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DepositLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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