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Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2023 | Jan. 31, 2022
Leases [Abstract] |  |
Cash paid for operating leases included in operating cash flows | $ 4,011 | $ 3,608
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets | 319 | 365
Leased assets changes arising from lease modifications | $ 575 | $ 2,798

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- Definition Lease liabilities arising from obtaining right-of-use assets for operating lease. + References No definition available. + Details
Name: | amba_LeaseLiabilitiesArisingFromObtainingRightOfUseAssetsForOperatingLease
Namespace Prefix: | amba_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Leased assets changes arising from lease modifications. + References No definition available. + Details
Name: | amba_LeasedAssetsChangesArisingFromLeaseModifications
Namespace Prefix: | amba_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
Name: | us-gaap_OperatingLeasePayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration