Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014	May. 31, 2014	Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 154,018	$ 171,842	$ 182,051	$ 151,927
Derivative assets	118	900	463
Derivative liabilities	(216)	(400)	(251)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	154,018	171,842	182,051
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	118	900	463
Derivative liabilities	$ (216)	$ (400)	$ (251)