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Summary of Significant Accounting Policies (Details) - Schedule of balance sheet items, except for equity accounts - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2023	Mar. 31, 2022
Balance sheet items, except for equity accounts
Chinese Renminbi	$ 6.86	$ 6.35
Myanmar Kyat	$ 2,103	$ 1,768

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- References

No definition available.

+ Details

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

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- Definition

Equity accounts.

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No definition available.

+ Details

Name:	hiho_EquityAccounts
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Equity accounts per share.

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No definition available.

+ Details

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