CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	May 31, 2013	Aug. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Accumulated foreign currency translation adjustments	$ 136.8	$ 149.1

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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