Note 3 - Receivables (Detail) - Impaired loans (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Recorded investment	$ 92.3	$ 77.5
Unpaid principal face	99.9	77.5
Related allowance	67.4	59.9
Average recorded investment	84.9	83.4
Contracts [Member] | Year To Date [Member]
Year-to-date
Total	0.4
Contracts [Member]
Recorded investment	17.3	2.5
Unpaid principal face	24.9	2.5
Related allowance	7.3	1.4
Average recorded investment	9.9	3.9
Notes [Member]
Recorded investment	75.0	75.0
Unpaid principal face	75.0	75.0
Related allowance	60.1	58.5
Average recorded investment	75.0	79.5
Year To Date [Member]
Year-to-date
Total	$ 0.4