Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2009
Other comprehensive income (loss):
Taxes on unrealized gain (loss) on derivatives	$ 119	$ 150	$ (2,339)
Taxes on defined benefit obligation	28	620	90
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss):
Taxes on unrealized gain (loss) on derivatives	119	150	(2,339)
Taxes on defined benefit obligation	$ 28	$ 620	$ 90