Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income Tax Provision (Benefit) for Continuing Operations Computed Using Federal Statutory Income Tax Rate (Parenthetical) (Detail)

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Income Taxes - Income Tax Provision (Benefit) for Continuing Operations Computed Using Federal Statutory Income Tax Rate (Parenthetical) (Detail)
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Income Tax Disclosure [Abstract]    
Corporate federal income tax rate 21.00% 21.00%