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Commitments and Contingencies - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Jun. 30, 2018
Other Commitments [Line Items]          
Deferred rent $ 30,500,000   $ 5,500,000    
Rent expense 5,800,000 $ 2,500,000 9,200,000 $ 4,700,000  
Letters of credit issued and outstanding 12,500,000   $ 12,200,000    
Restricted cash 8,560,000 $ 279,000 [1]      
Letter of Credit          
Other Commitments [Line Items]          
Draws on line of credit 0        
San Francisco - Ten Year Lease          
Other Commitments [Line Items]          
Restricted cash $ 8,000,000        
Financial Standby Letter of Credit          
Other Commitments [Line Items]          
Standby letter of credit         $ 3,000,000
[1] See Note 2 for a summary of adjustments.