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v3.20.2

Concentrations of Credit Risk and Major Customers (Details 1) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accounts Receivable ,Percentage |  | 69.00% | 76.90% | 78.00%
Customer A [Member] |  |  |  |
Accounts Receivable ,Percentage | [1] | 48.20% | 47.70% | 51.40%
Customer B [Member] |  |  |  |
Accounts Receivable ,Percentage | [1] | 20.80% | 18.00% | 15.80%
Customer C [Member] |  |  |  |
Accounts Receivable ,Percentage | [2] |  | 11.20% | 10.80%
[1] | Sales to this customer were reported in both of the Metal Stamping and Mechanical OEM and Electric OEM operating segments.
[2] | Sales to this customer were reported in the Electric OEM operating segment.

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- Definition Percentage of accounts receivable during the period. + References No definition available. + Details
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Name: | srt_MajorCustomersAxis=hiho_CustomerAMember
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Name: | srt_MajorCustomersAxis=hiho_CustomerBMember
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- Details
Name: | srt_MajorCustomersAxis=hiho_CustomerCMember
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