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Summary of Business and Significant Accounting Policies (Concentration of Credit risk) (Details)	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Revenue Benchmark | Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk (percent)	4.50%	6.30%
Revenue Benchmark | Customer Concentration Risk [Member] | No Customers
Concentration Risk [Line Items]
Concentration risk (percent)	10.00%	10.00%
Accounts Receivable | Customer Concentration Risk [Member] | One Customer
Concentration Risk [Line Items]
Concentration risk (percent)	12.30%
Accounts Receivable | Customer Concentration Risk [Member] | No Customers
Concentration Risk [Line Items]
Concentration risk (percent)		10.00%

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