XML 67 R57.htm IDEA: XBRL DOCUMENT
v3.23.1

Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022
Stock-based compensation: |  |
Total stock-based compensation | $ 27,265 | $ 27,041
Cost of revenue [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | 941 | 349
Research and development [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | 18,361 | 17,151
Selling, general and administrative [Member] |  |
Stock-based compensation: |  |
Total stock-based compensation | $ 7,963 | $ 9,541

X
- Definition Stock based compensation. + References No definition available. + Details
Name: | amba_StockBasedCompensationAbstract
Namespace Prefix: | amba_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |