Comprehensive Income (Schedule Of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Comprehensive Income [Abstract]
Net Income	$ 8,759	$ 18,823	$ 12,774	$ 2,921	$ 5,902	$ 15,289	$ 11,325	$ 4,286	$ 43,277	$ 36,802	$ 24,862
Defined benefit pension plan									(408)	69	(50)
Cash flow hedges									200	319	1,201
Foreign currency translation, net of hedging activities									(7,131)	4,719	(2,791)
Total other comprehensive income (loss), net of tax expense (benefit) of $394, $440 and$1,104									(7,339)	5,107	(1,640)
Total other comprehensive income									35,938	41,909	23,222
Tax expense (benefit)									$ 394	$ 440	$ 1,104