Commitments and Contingencies - Schedule of Non-Cancelable Minimum Payments Applicable to Operating and Capital Leases (Details) $ in Thousands	Apr. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, due in one year	$ 814
Operating Leases, due in two years	470
Operating Leases, due in three years	443
Operating Leases, due in four years	422
Operating Leases, due in five years	374
Operating Leases, due thereafter	2,817
Operating Leases, future minimum payments due	5,340
Capital Leases, future minimum payments due, next twelve months	171
Capital Leases, future minimum payments due in two years	61
Capital Leases, future minimum payments due in three years	15
Capital Leases, future minimum payments due in four years	2
Capital Leases, future minimum payments due in five years	0
Capital Leases, future minimum payments due thereafter	0
Capital Leases, future minimum payments due	$ 249