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Property, Plant and Equipment, Net by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011	May 31, 2010
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 443,077	$ 405,334	$ 506,163
UNITED STATES
Segment Reporting Information [Line Items]
Property, plant and equipment, net	371,269	337,894	459,174
CANADA
Segment Reporting Information [Line Items]
Property, plant and equipment, net	1,270	1,368	1,055
Europe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	59,209	49,627	45,934
Other Countries
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 11,329	$ 16,445

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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