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v3.25.2

Government Grants and Subsidies (Details) ¥ in Thousands, K in Thousands, $ in Thousands | 12 Months Ended
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Mar. 31, 2025 USD ($) | Mar. 31, 2025 MMK (K) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 CNY (¥) | Mar. 31, 2023 USD ($)
Government Grants and Subsidies [Line Items] |  |  |  |  |
Percentage of rental payment |  |  |  |  | 50.00%
Maximum subsidy per employee |  | K 9,000 |  |  | $ 1
Employment subsidy |  |  | $ 0 |  |
Shenzhen [Member] |  |  |  |  |
Government Grants and Subsidies [Line Items] |  |  |  |  |
Employment subsidy |  |  | $ 0 | ¥ 1,000 |

X
- Definition Amount of employment subsidy. + References No definition available. + Details
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Namespace Prefix: | hiho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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

X
- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_GovernmentAssistanceTypeAxis=hiho_ShenzhenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |