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Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011	May 31, 2010
Investment in Country with High Inflationary Economy [Line Items]
Percentage of consolidated revenues from small service location			1.00%
Official published exchange rate					5.30
Recognized gains or losses related to the Venezuelan currency	$ (114,000)	$ 107,000	$ (188,000)	$ (164,000)
Venezuela
Investment in Country with High Inflationary Economy [Line Items]
Recognized gains or losses related to the Venezuelan currency			0	0
Net assets of Venezuelan subsidiary	2,700,000		2,700,000
Denominated receivables and cash of Venezuelan subsidiary	$ 3,000,000		$ 3,000,000

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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