Intangibles and Other Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Schedule of Intangible Assets Disclosure [Line Items]
Amortization expense	$ 1.5	$ 0.9	$ 5.3	$ 2.7
Future amortization expense, 2016	6.3		6.3
Future amortization expense, 2017	3.6		3.6
Future amortization expense, 2018	3.5		3.5
Future amortization expense, 2019	3.4		3.4
Future amortization expense, 2020	$ 3.4		$ 3.4