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Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Accumulated Other Comprehensive Income [Line Items]      
Foreign currency translation adjustment $ 149,116 $ 228,439  
Unrecognized gains (losses) on derivative instruments, net of tax (7,153) (11,172) (16,086)
Actuarial loss, net of tax (35,783) (22,689)  
Prior service cost, net of tax 95 128  
Accumulated other comprehensive income $ 106,275 $ 194,706