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Balance Sheets (Parenthetical) - shares	Jan. 31, 2021	Jan. 31, 2020
Balance Sheets
Certificate of beneficial interest of Land Trust, units	13,120,010	13,120,010

Number of shares issued which are neither cancelled nor held in the treasury.

No definition available.

Name:	us-gaap_SharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

No definition available.

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