Note 6. Derivative Instruments (Detail) (USD $)			3 Months Ended		3 Months Ended	6 Months Ended
Feb. 29, 2012	Aug. 31, 2011	Nov. 30, 2011 Indian Rupee [Member]	Feb. 29, 2012 Indian Rupee [Member]	Nov. 30, 2010 Japanese Yen [Member]	Aug. 31, 2010 Net British Pound Sterling Exposure [Member]	Aug. 31, 2010 Net Euro Exposure [Member]
Percent Of Foreign Exchange Contracts Hedged			90.00%		95.00%	95.00%	95.00%
Notional Amount of Foreign Currency Fair Value Hedge Derivatives (in Dollars)	$ 16,500,000	$ 8,618,000		$ 16,500,000
Foreign Currency Derivatives at Fair Value, Net (in Dollars)				$ 800,000

Fair value as of the balance sheet date of foreign currency derivative assets, net of foreign currency derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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