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Government Grants and Subsidies (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2021
Government Grants and Subsidies [Abstract]
Percentage of rental payment	50.00%
Maximum subsidy of per share		$ 1,200
Maximum subsidy per employee	$ 1

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- References

No definition available.

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Namespace Prefix:	hiho_
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- Definition

Maximum subsidy to employee per share.

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No definition available.

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Namespace Prefix:	hiho_
Data Type:	dtr:perShareItemType
Balance Type:	na
Period Type:	instant

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- Definition

Percentage of rental payment.

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No definition available.

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Namespace Prefix:	hiho_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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