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STAFF RETIREMENT PLANS (DETAILS TEXTUAL) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Staff Retirement Plans [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	5.00%
Defined Contribution Plan, Cost Recognized	$ 193	$ 215	$ 186

X

- References

No definition available.

+ Details

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Namespace Prefix:	hiho_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 70



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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