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Financial Assets Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (Cash, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash deposits	$ 77.2	$ 71.0

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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