Derivative Financial Instruments and Hedging Activities (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2016	Aug. 31, 2007	May 31, 2016	Feb. 29, 2016	Aug. 31, 2015	Aug. 31, 2011	Feb. 28, 2011
Derivative [Line Items]
Hedge accounting adjustment related to terminated interest rate swaps	$ 297		$ 297		$ 2,077
Forward foreign exchange contracts
Derivative [Line Items]
Aggregate notional amount outstanding	1,300,000		1,300,000		1,800,000
Forward foreign exchange contracts | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount outstanding	245,100		245,100		$ 615,100
7.750% Senior Notes Due 2016 | Interest rate swap | Fair value hedging
Derivative [Line Items]
Aggregate notional amount outstanding							$ 200,000
Fair value of interest rate swap including accrued interest on interest rate swap						$ 12,200
Accrued interest on interest rate swaps						$ 600
Amortization of interest rate swaps			$ 1,800
8.250% Senior Notes Due 2018 | Interest rate swap | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount outstanding		$ 400,000
Payment to settle interest rate swaps		$ 43,100
Anticipated Debt Issuance [Member] | Treasury Lock [Member]
Derivative [Line Items]
Aggregate notional amount outstanding				$ 200,000
Positive cash settlement	$ 100
Anticipated Debt Issuance [Member] | Treasury Lock [Member] | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount outstanding				$ 200,000