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CONCENTRATIONS OF CREDIT RISK AND MAJOR CUSTOMERS (DETAILS 2)

12 Months Ended

Mar. 31, 2016

Mar. 31, 2015

Mar. 31, 2014

Customer A [Member]

Concentration Of Credit Risk And Major Customers [Line Items]

Accounts Receivable Percentage

^[1]

44.10%

38.30%

36.90%

Customer B [Member]

Concentration Of Credit Risk And Major Customers [Line Items]

Accounts Receivable Percentage

^[2]

12.20%

13.10%

0.00%

Customer C [Member]

Concentration Of Credit Risk And Major Customers [Line Items]

Accounts Receivable Percentage

^[2]

14.00%

0.00%

0.00%

[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.

X

- Definition

Percentage of accounts receivable during the period.

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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X

- Details

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X

- Details

Name:	us-gaap_MajorCustomersAxis=hiho_CustomerBMember
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X

- Details

Name:	us-gaap_MajorCustomersAxis=hiho_CustomerCMember
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