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Derivatives Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Aug. 31, 2014
USD ($)
Aug. 31, 2015
USD ($)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Notional Amount         $ 300.0
Cash paid to settle derivatives $ 5.1 $ 5.3 $ 6.4    
Derivatives settled, number 2 2 2    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring       $ 13.5