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Commitments and Contingencies (Detail)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2014
USD ($)
a
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]        
Rent expense   $ 23,000 $ 19,000  
Lease term period 95 years      
Parcel of vacant land (in acres) | a 6.9      
Prepayments for computing infrastructure platform $ 2,000 11,403   $ 13,588
Annual rent payments plus increases based on increases in consumer price index   $ 200