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Accrued and Other Current Liabilities - Additional Information (Detail) $ in Millions	3 Months Ended
	Apr. 30, 2023 USD ($)
Schedule of Accrued Liabilities [Line Items]
Annual bonus paid	$ 5.6
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	$ 4.5

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

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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: