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Commitments and Contingencies (Details) (Property and inventory purchase commitments, USD $) In Thousands, unless otherwise specified	Aug. 31, 2014
Property and inventory purchase commitments
Commitments and Contingencies
Purchase obligations	$ 2,456

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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