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Losses Due to Repurchases under Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Loss Contingencies [Line Items]
Cost of units repurchased	$ 598	$ 3,650	$ 1,047	$ 5,778
Realization of units resold	526	3,290	916	5,059
Losses due to repurchase	$ 72	$ 360	$ 131	$ 719