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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (DETAILS TEXTUAL) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Significant Accounting Policies [Line Items]
Loans Receivable Percentage	10.00%
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net Of Tax	$ (42)	$ 1	$ (9)
Accounts Receivable [Member]
Significant Accounting Policies [Line Items]
Accounts Receivable Percentage	80.00%	78.00%	54.00%
Loans Receivable Percentage	69.20%	66.60%
Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Other Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Minimum [Member] | Other Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years

X

- Definition

Percentage of accounts 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

X

- 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

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

X

- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b,c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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