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CONCENTRATIONS OF CREDIT RISK AND MAJOR CUSTOMERS (Details) | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Three largest receivable balances | 10.00% |
Accounts Receivable [Member] |  |
Three largest receivable balances | 72.90% | 69.20%
Accounts Receivable [Member] | Customer A [Member] |  |
Three largest receivable balances | 47.90% | 45.30%
Accounts Receivable [Member] | Customer B [Member] |  |
Three largest receivable balances | 13.00% | 12.90%
Accounts Receivable [Member] | Customer C [Member] |  |
Three largest receivable balances | 12.00% | 11.00%

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- Definition Percentage of loans receivable during the period. + References No definition available. + Details
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Namespace Prefix: | hiho_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |