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Investments In Equity Method Investees (Details) - Schedule of investments in equity method investees - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Schedule of investments in equity method investees [Abstract] |  |
The Group’s proportionate share of equity in the net assets of equity investees | $ 5 | $ 5
Less: Accumulated impairment losses recognized | (5) | (5)
Investments in equity investees reported in the consolidated balance sheets |  |

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- Definition Accumulated impairment losses recognized in the net asset of equity investees + References No definition available. + Details
Name: | hiho_AccumulatedImpairmentLossesRecognized
Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition It represents the group's equity interest in the net assets of equity investees as on date. + References No definition available. + Details
Name: | hiho_GroupsProportionateShareOfEquityInNetAssetsOfEquityInvestees
Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant