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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

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Namespace Prefix:	top_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	top_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of expense for employee benefit and equity-based compensation.

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: