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Income Taxes - Tax Credit Carryforwards (Details)
$ in Thousands
Jan. 31, 2021
USD ($)
Tax Credit Carryforward [Line Items]  
Tax credit carryforward $ 4,928
Research and Development  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 4,589
Work Opportunity  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 339
2022  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 62
2022 | Research and Development  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 62
2022 | Work Opportunity  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 0
2023  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 82
2023 | Research and Development  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 82
2023 | Work Opportunity  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 0
2039  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 1,536
2039 | Research and Development  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 1,536
2039 | Work Opportunity  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 0
2040  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 3,248
2040 | Research and Development  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward 2,909
2040 | Work Opportunity  
Tax Credit Carryforward [Line Items]  
Tax credit carryforward $ 339