Minimum Lease Payment Obligations Under Non-Cancelable Leases (Detail) $ in Thousands	Jan. 31, 2018 USD ($)
Leases Future Minimum Payments [Line Items]
Remainder of 2018	$ 2,831
2019	4,905
2020	3,866
2021	2,833
2022	1,878
Thereafter	4,677
Total minimum lease payments	20,990
Facilities
Leases Future Minimum Payments [Line Items]
Remainder of 2018	2,501
2019	4,404
2020	3,556
2021	2,716
2022	1,836
Thereafter	4,677
Total minimum lease payments	19,690
Equipment
Leases Future Minimum Payments [Line Items]
Remainder of 2018	330
2019	501
2020	310
2021	117
2022	42
Total minimum lease payments	$ 1,300