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 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Aug. 31, 2012
Restructuring and Related Activities [Abstract]          
Restructuring costs $ 1.0 $ 0.9 $ 1.7 $ 1.4  
Restructuring reserve $ 1.7   $ 1.7   $ 2.9