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Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Feb. 28, 2013	Jan. 31, 2013	Feb. 28, 2013 Venezuela	Aug. 31, 2013 Venezuela
Investment in Country with High Inflationary Economy [Line Items]
Percentage of consolidated revenues from small service location	1.00%
Official published exchange rate			6.30	5.30
Recognized losses related to the Venezuelan currency	$ (390,000)	$ (74,000)			$ (600,000)
Net assets of Venezuelan subsidiary						2,900,000
Denominated receivables and cash of Venezuelan subsidiary						$ 1,700,000

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