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Commitments and Contingencies (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2014
USD ($)
a
Oct. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]            
Rent expense   $ 25,000 $ 21,000 $ 72,000 $ 60,000  
Lease term period 95 years          
Parcel of vacant land (in acres) | a 6.9          
Prepayments for computing infrastructure platform $ 2,000 $ 10,738   10,738   $ 13,588
Annual rent payments plus increases based on increases in consumer price index       $ 200