Intangibles and Other Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Aug. 31, 2016
Schedule of Intangible Assets Disclosure [Line Items]
Amortization expense	$ 1.7	$ 1.2
Future amortization expense, 2017			$ 4.4
Future amortization expense, 2018			3.8
Future amortization expense, 2019			3.4
Future amortization expense, 2020			3.7
Future amortization expense, 2021			$ 3.4