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Leases (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 29, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Leases [Abstract] |  |  |
Lease, description | the Group entered into a lease agreement for factory space located in Yangon, Myanmar that expire in March 2069. The lease for the factory space has a term of 50 years, Kayser Myanmar has the option to extend the lease term for two consecutive 10-year terms on the same terms and conditions as in effect for the initial 50-year period. Kayer Myanmar is obligated under the lease to make monthly lease payment equal to 10 million Myanmar Kyat (equivalent to $7.3 per month as of March 31, 2021). During the year ended March 31, 2019, Kayser Myanmar has paid Konig Company $950 as prepaid rent under the lease, approximately 12 years of rental payments. |  |
Operating lease cost government subsidy and sublease income |  | $ 66 | $ 289

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- Definition Description on lease. + 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 Operating lease cost government subsidy. + References No definition available. + Details
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Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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