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Common Stock and Stockholders' Equity - Narrative (Details)
$ in Thousands
 12 Months Ended
Jan. 31, 2020
USD ($)
vote
shares
Jan. 31, 2019
USD ($)
shares
Jan. 31, 2018
USD ($)
shares
Class of Stock [Line Items]      
Non-cash charitable contributions $ 1,746 $ 1,008 [1] $ 708 [1]
Class A Common Stock      
Class of Stock [Line Items]      
Number of votes per share | vote 1    
Class A Common Stock | Contribution of Nonmonetary Assets to Charitable Organization      
Class of Stock [Line Items]      
Issuance of common stock pursuant to charitable donation (in shares) | shares 15,000 20,000  
Non-cash charitable contributions $ 1,700 $ 1,000  
Class B Common Stock      
Class of Stock [Line Items]      
Number of votes per share | vote 10    
Class B Common Stock | Contribution of Nonmonetary Assets to Charitable Organization      
Class of Stock [Line Items]      
Issuance of common stock pursuant to charitable donation (in shares) | shares     24,287
Non-cash charitable contributions     $ 700
[1] Adjusted for adoption of ASC 842. See Note 2.