Future Minimum Rental Payments under Capital and Operating Leases (Detail) $ in Thousands	Jul. 31, 2019 USD ($)
Leases [Abstract]
For the fiscal year ending July 31, 2020	$ 974
For the fiscal year ending July 31, 2021	993
For the fiscal year ending July 31, 2022	1,015
For the fiscal year ending July 31, 2023	1,037
For the fiscal year ending July 31, 2024	1,061
For the fiscal year ending July 31, 2025 and thereafter	3,037
Total minimum lease payments	8,117
Less amount representing interest	(2,427)
Present value of net minimum capital lease payments	5,690
Less current portion	(444)
Long-term capital lease obligations	5,246
For the fiscal year ending July 31, 2020	8,785
For the fiscal year ending July 31, 2021	6,809
For the fiscal year ending July 31, 2022	5,437
For the fiscal year ending July 31, 2023	3,980
For the fiscal year ending July 31, 2024	3,424
For the fiscal year ending July 31, 2025 and thereafter	20,745
Total minimum lease payments	$ 49,180