Annual report pursuant to Section 13 and 15(d)

Restructuring - Additional Information (Detail)

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Restructuring - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Restructuring Cost and Reserve [Line Items]      
Restructuring cost recognized Cost of products sold $ 3.9 $ 2.3 $ 16.7
Restructuring reserve $ 2.9 $ 3.6