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Leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Lessee, Lease, Description [Line Items]    
Operating lease right-of-use assets $ 280,145  
Operating lease liabilities 310,144  
Operating lease, lease not yet commenced, payment $ 21,000  
Minimum    
Lessee, Lease, Description [Line Items]    
Leases, remaining lease term, period (less than) (years) 1 year  
Operating lease, lease not yet commenced, term (years) 4 years 10 months 24 days  
Maximum    
Lessee, Lease, Description [Line Items]    
Leases, remaining lease term, period (less than) (years) 10 years  
Operating lease, lease not yet commenced, term (years) 9 years  
Pleasanton, California | Chairman, Mr. Duffield    
Lessee, Lease, Description [Line Items]    
Operating lease right-of-use assets $ 55,000  
Operating lease liabilities $ 68,000  
Term of agreements (in years) 5 years 4 months 24 days  
Rent expense $ 3,000 $ 3,000