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Export Sales and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Export Sales and Foreign Operations
Export sales	$ 21,204	$ 19,715	$ 18,069
Concentration risk
Long-lived assets	49,279	28,594
United Kingdom
Concentration risk
Goodwill and intangible assets	11,652	13,267
Revenues \| Geographic concentration risk \| United Kingdom
Concentration risk
Percentage of concentration risk	12.00%	12.00%	13.00%
Long-lived assets \| Geographic concentration risk \| United Kingdom
Concentration risk
Long-lived assets	$ 4,488	$ 2,796

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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