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Note 12 - Credit Facilities and Indebtedness (Detail) - Convertible Debt (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Convertible Notes [Member]
Contractual interest expense	$ 27.5	$ 27.5	$ 27.5
Discount amortization	33.4	30.6	28.0
Remaining discount amortization period (years)	1 year 219 days
Convertible Debentures [Member]
Contractual interest expense			3.8
Discount amortization			$ 2.7

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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