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Summary of Significant Accounting Policies (Details) - Schedule of revenue recognition by product line - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Schedule Of Revenue Recognition By Product Line Abstract |  |  |
Sale of products | $ 10,201 | $ 12,351 | $ 9,168
Maintenance service income | 41 | 14 |
Total revenue recognition | $ 10,242 | $ 12,365 | $ 9,168

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- Definition Revenue recognition sales of product. + References No definition available. + Details
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Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of consideration recognized during the period for the milestone or milestones. + References No definition available. + Details
Name: | us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration