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Note 10 - Credit Facilities and Indebtedness (Detail) - Convertible Debt (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Contractual interest expense	$ 6.9	$ 6.9	$ 13.8	$ 13.8
Discount amortization	$ 9.1	$ 8.3	$ 18.0	$ 16.4
Remaining discount amortization period (years)	1 year 36 days

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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