Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Additional information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 06, 2016	Apr. 30, 2016	Jul. 31, 2015	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Investment [Line Items]
Trading securities		$ 16,937	$ 78,716		$ 16,937
Sale of trading securities		12,900	3,900	$ 0		$ 0
Unsettled trades associated with the sale of common stock of a publicly traded entity					2,100
Gains (losses) in trading securities		1,860		$ 3,227	(6,488)	5,328
Sale (purchase) of trading securities					57,056	$ (69,221)
Cash
Investment [Line Items]
Gains (losses) in trading securities		700	800		6,200
Cash \| Subsequent Event
Investment [Line Items]
Gains (losses) in trading securities	$ 300
Non Cash
Investment [Line Items]
Gains (losses) in trading securities		1,200			(12,700)
Convertible Debt Securities
Investment [Line Items]
Trading securities		$ 12,100	$ 41,300		$ 12,100