Intangibles and Other Assets, Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Schedule of Intangible Assets Disclosure [Line Items]
Amortization expense	$ 1.7	$ 1.3
Future amortization expense, 2014	4.5
Future amortization expense, 2015	3.8
Future amortization expense, 2016	3.8
Future amortization expense, 2017	3.7
Future amortization expense, 2018	$ 3.4