Valuation Allowance for Deferred Taxes (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Partial release of U.S. valuation allowance	$ 104.0
U.S.
Valuation and Qualifying Accounts Disclosure [Line Items]
Federal net operating loss carry forwards	424.1
Non U.S.
Valuation and Qualifying Accounts Disclosure [Line Items]
Federal net operating loss carry forwards	532.3
Increase in non U.S. unrecognized tax benefit	50.0
Expired And Internal Revenue Code Section Three Eight Two Limited | U.S.
Valuation and Qualifying Accounts Disclosure [Line Items]
Federal net operating loss carry forwards	$ 70.3