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v3.22.2

Concentrations of Credit Risk and Major Customers (Details) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Concentrations of Credit Risk and Major Customers (Details) [Line Items] |  |  |
Customers accounting percentage | 10.00% |  |
Accounts Receivable [Member] |  |  |
Concentrations of Credit Risk and Major Customers (Details) [Line Items] |  |  |
Customers accounting percentage | 10.00% | 10.00% | 10.00%
Total Customer [Member] |  |  |
Concentrations of Credit Risk and Major Customers (Details) [Line Items] |  |  |
Number of customer | 4 |  |
Customers accounting percentage | 10.00% | 10.00% |
Total Customer [Member] |  |  |
Concentrations of Credit Risk and Major Customers (Details) [Line Items] |  |  |
Number of customer | 3 |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator), this concept represents the concentration percentage derived from the division. + References No definition available. + Details
Name: | hiho_ConcentrationRiskThresholdPercentage
Namespace Prefix: | hiho_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Total number of customer. + References No definition available. + Details
Name: | hiho_NumberOfCustomer
Namespace Prefix: | hiho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=hiho_FourCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=hiho_ThreeCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |