Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	Aug. 31, 2013
Debt Instrument [Line Items]
Other	$ 80	$ 306
Total long-term debt	437,318	447,294
Less long-term debt due within one year	(9,791)	(9,914)
Long-term debt due after one year	427,527	437,380
2013 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	155,000	155,000
2011 Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 282,238	$ 291,988