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Investments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016
Investment [Line Items]
Sale (purchase) of trading securities	$ 4,900	$ 14,800	$ 5,800	$ 43,700
Gains (losses) in trading securities	1,011	1,115	94	(8,348)
Sale of trading securities		15,500
Unsettled trades associated with the sale of common stock of a publicly traded entity				800
Trading securities	11,029		11,029		$ 16,768
Convertible Debt Securities
Investment [Line Items]
Trading securities					$ 12,600
Non Cash
Investment [Line Items]
Gains (losses) in trading securities	400	100	500	13,800
Cash
Investment [Line Items]
Gains (losses) in trading securities	$ 600	$ 1,200	$ 600	$ 5,500