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Subsequent Events - Additional Information (Detail) - Stock Repurchase Program [Member] - USD ($) $ in Millions	May 26, 2023	May 27, 2022	Jun. 07, 2023	Apr. 30, 2023
Subsequent Event [Line Items]
Stock repurchase program, authorization date		May 27, 2022
Stock repurchase program, extended expiration period		12 months
Stock repurchase program, extended expiration date		Jun. 30, 2023
Amount available under stock repurchase program				$ 49.0
Subsequent Events [Member]
Subsequent Event [Line Items]
Stock repurchase program, extension authorization date	May 26, 2023
Stock repurchase program extension period	12 months
Stock repurchase program, extended expiration date	Jun. 30, 2024
Amount available under stock repurchase program			$ 49.0

X

- Definition

Stock repurchase program authorization date.

+ References

No definition available.

+ Details

Name:	amba_StockRepurchaseProgramAuthorizationDate
Namespace Prefix:	amba_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock repurchase program, extended expiration date.

+ References

No definition available.

+ Details

Name:	amba_StockRepurchaseProgramExtendedExpirationDate
Namespace Prefix:	amba_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock repurchase program, extended expiration period.

+ References

No definition available.

+ Details

Name:	amba_StockRepurchaseProgramExtendedExpirationPeriod
Namespace Prefix:	amba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock repurchase program extension authorization date.

+ References

No definition available.

+ Details

Name:	amba_StockRepurchaseProgramExtensionAuthorizationDate
Namespace Prefix:	amba_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock repurchase program extension period.

+ References

No definition available.

+ Details

Name:	amba_StockRepurchaseProgramExtensionPeriod
Namespace Prefix:	amba_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PlanNameAxis=amba_StockRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: