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v3.23.2

Summary of Significant Accounting Policies (Details) - Schedule of depreciation using straight-line method based on the estimated useful life | 12 Months Ended
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Mar. 31, 2021
Computer and Electronic Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 3 years
Computer and Electronic Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Software [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 3 years
Software [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years
Furniture and fixtures [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 4 years
Investment properties [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 50 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=top_InvestmentPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |