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Commitments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Commitments [Line Items]
Rent expense under operating leases	$ 2.0	$ 1.9	$ 2.0
Inventory and other purchase commitments for 2013	$ 5.5

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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