Related Party Transactions - Additional Information (Detail) - Management Services Agreement - USD ($)				3 Months Ended		6 Months Ended
	Mar. 10, 2016	Jun. 30, 2015	Dec. 24, 2014	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016
SP Corporate
Related Party Transaction [Line Items]
Management services agreement, effective date of agreement			Jan. 01, 2015
Management services agreement, amended expiration date of agreement		Dec. 31, 2015
Management services agreement, renew period		1 year
Management services agreement term						6 months
SPH Services
Related Party Transaction [Line Items]
Fixed monthly fee to be paid in consideration of services and incremental cost	$ 175,000
Total expenses incurred related to Management Services Agreement and Transfer Agreement				$ 500,000	$ 600,000	$ 1,100,000	$ 1,100,000
Amount due to related parties				$ 200,000		$ 200,000		$ 500,000