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Note 1 - Summary of Significant Accounting Policies (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Treasury Stock, Shares, Retired (in Shares)	75.0
Treasury Stock [Member]
Treasury Stock, Retired, Par Value Method, Amount (in Dollars)	1,252.2
Additional Paid-in Capital [Member]
Treasury Stock, Retired, Par Value Method, Amount (in Dollars)	215.1
Retained Earnings [Member]
Treasury Stock, Retired, Par Value Method, Amount (in Dollars)	1,037.1

Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the par value method.

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