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Inventories, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Inventory Disclosure [Abstract]
Slow moving inventories	$ 125	$ 39	$ 419

X

- Definition

slow moving inventories during the period.

+ References

No definition available.

+ Details

Name:	hiho_SlowMovingInventories
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration