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Staff Retirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Employer matching contribution percent	5.00%
Cost of contribution to the staff retirement plans	$ 223	$ 114	$ 242
Hong Kong [Member]
Mandatory provident fund, description	The MPF is available to all employees aged 18 to 64 with at least 60 days of service under the employment of the Group in Hong Kong.

X

- Definition

Description of mandatory provident fund.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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

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

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	hiho_AllCountriesAxis=country_HK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: