Quarterly report pursuant to Section 13 or 15(d)

Restructuring - Additional Information (Detail)

v2.4.0.6
Restructuring - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Aug. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 0.7 $ 0.5  
Restructuring reserve $ 2.3   $ 2.9