Revenue Recognition - Disaggregation of Revenue by Region According to Location of Customers (Parenthetical) (Details) - Revenue - Geographic Concentration Risk	3 Months Ended
Apr. 30, 2021	Apr. 30, 2020
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%
United States
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	40.00%	33.00%
Japan
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	15.00%	19.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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