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Inventories, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Inventories, Net [Abstract] |  |  |
Slow moving inventories | $ 67 | $ 89 | $ 125

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- Definition slow moving inventories during the period. + References No definition available. + Details
Name: | hiho_SlowMovingInventories
Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration