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Leases - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Lessee, Lease, Description [Line Items]        
Operating lease right-of-use assets $ 294,824   $ 294,824  
Operating lease liabilities 309,417   309,417  
Operating lease, lease not yet commenced, payment $ 33,000   $ 33,000  
Minimum        
Lessee, Lease, Description [Line Items]        
Leases, remaining lease term, period (less than) (years)     1 year  
Operating lease, lease not yet commenced, term (years) 3 years   3 years  
Maximum        
Lessee, Lease, Description [Line Items]        
Leases, remaining lease term, period (less than) (years)     10 years  
Operating lease, lease not yet commenced, term (years) 6 years   6 years  
Pleasanton, California | Chairman, Mr. Duffield        
Lessee, Lease, Description [Line Items]        
Operating lease right-of-use assets $ 53,000   $ 53,000  
Operating lease liabilities $ 64,000   $ 64,000  
Term of agreements (in years) 5 years   5 years  
Rent expense $ 3,000 $ 2,000 $ 6,000 $ 5,000