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Commitments and Contingencies (Details) (Property and inventory purchase commitments, USD $) In Thousands, unless otherwise specified	May 31, 2014 sqft
Property and inventory purchase commitments
Commitments and Contingencies
Purchase obligations	$ 1,236
Purchase obligations for construction of Griffin Land, square feet	303,000

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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