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v3.19.2

Concentrations of Credit Risk and Major Customers (Details 1) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Accounts Receivable ,Percentage |  | 76.90% | 78.00% | 79.30%
Customer A [Member] |  |  |  |
Accounts Receivable ,Percentage | [1] | 47.70% | 51.40% | 46.00%
Customer B [Member] |  |  |  |
Accounts Receivable ,Percentage | [1] | 18.00% | 15.80% | 10.70%
Customer C [Member] |  |  |  |
Accounts Receivable ,Percentage | [2] | 11.20% | 10.80% | 11.60%
Customer D [Member] |  |  |  |
Accounts Receivable ,Percentage | [2] |  |  | 11.00%
[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_CustomerCMember
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