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Consolidated Statements Of Stockholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2012	May 31, 2011
Statement of Stockholders' Equity [Abstract]
Taxes on unrealized loss on derivatives	$ 575	$ 57

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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