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Inventory - Additional Information (Details) - USD ($)	Mar. 31, 2021	Mar. 31, 2020
Inventory Disclosure [Abstract]
Inventory was pledged as collateral	$ 0	$ 0

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- Definition

Inventories pledged as security for liabilities.

+ References

No definition available.

+ Details

Name:	ffntf_InventoriesPledgedAsSecurityForLiabilities
Namespace Prefix:	ffntf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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