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v3.23.2

Government Grants and Subsidies (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
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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. + Details
Name: | hiho_GovernmentGrantsAndSubsidieDiscosureAbstract
Namespace Prefix: | hiho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum subsidy to employee per share. + References No definition available. + Details
Name: | hiho_MaximumSubsidyToEmployeePerShare
Namespace Prefix: | hiho_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of rental payment. + References No definition available. + Details
Name: | hiho_PercentageOfRentalPayment
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. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration