Commitments and Contingencies - Schedule of Non-Cancelable Minimum Payments Applicable to Operating and Capital Leases (Details) $ in Thousands	Apr. 30, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Operating leases, due in one year	$ 1,375
Operating Leases, due in two years	1,057
Operating leases, due in three years	626
Operating leases, due in four years	338
Operating leases, due in five years	374
Operating leases, due thereafter	3,637
Operating leases, future minimum payments due	7,407
Capital leases, future minimum payments due, next twelve months	381
Capital leases, future minimum payments due in two years	239
Capital leases, future minimum payments due in three years	81
Capital leases, future minimum payments due in four years	18
Capital leases, future minimum payments due in five years	0
Capital leases, future minimum payments due thereafter	0
Capital leases, future minimum payments due	$ 719