RECEIVABLES (Narrative) (Details) - USD ($)	12 Months Ended
Jan. 31, 2020	Jan. 31, 2019
RECEIVABLES [abstract]
Accounts receivable more than 90 days past due	$ 40,911	$ 6,000

Represents amount of accounts receivable more than 90 days past due.

No definition available.

Name:	cxxif_AccountsReceivableMoreThanNinetyDaysPastDue
Namespace Prefix:	cxxif_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration