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v3.23.2

Share-based compensation (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Share-based compensation (Details) [Line Items] |  |
Ordinary shares with a fair value |  | 5,000
Director [Member] |  |
Share-based compensation (Details) [Line Items] |  |
Aggregation of ordinary shares |  | 4,365
Share-based compensation expenses (in Dollars) | $ 50,173 |

X
- References No definition available. + Details
Name: | top_AggregationOfOrdinaryShares
Namespace Prefix: | top_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | top_SharebasedcompensationDetailsLineItems
Namespace Prefix: | top_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for employee benefit and equity-based compensation. + References No definition available. + Details
Name: | us-gaap_EmployeeBenefitsAndShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |