Unusual Items - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2014
Unusual or Infrequent Item [Line Items]
Realized gains (losses) and interest	$ 0.7			$ (0.1)
Loss on debt repurchased	$ 0.5	$ 45.9	$ 0.7	$ 50.8	$ 60.6
Delayed Draw Term Loan [Member]
Unusual or Infrequent Item [Line Items]
Retired principal amount			26.0
Loss on debt repurchased			$ 0.7