Basis of Presentation - Transaction Related to Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Apr. 30, 2013	Apr. 30, 2012
Notes Payable [Line Items]
Beginning fair value - August 1, 2012	$ 3,486
Imputed interest	366
Change in estimates	(537)
Interest benefit	(171)
Payments	(201)	(168)
Ending fair value - April 30, 2013	$ 3,142

The increase (decrease) during the reporting period in the amount owed by the reporting entry in the form of loans and obligations (generally evidenced by promissory notes) made by the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The amount for notes payable (written promise to pay), due to related parties.

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- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

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