Note 4 - Receivables (Detail) - Impaired loans (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Recorded investment	$ 77.5	$ 89.2
Unpaid principal face	77.5	90.3
Related allowance	59.9	58.6
Average recorded investment	83.4	96.4
Contracts [Member] | Quarter To Date [Member]
Total		0.2
Contracts [Member] | Year To Date [Member]
Total		0.7
Cash-basis	0
Contracts [Member]
Recorded investment	2.5	5.2
Unpaid principal face	2.5	5.1
Related allowance	1.4	2.8
Average recorded investment	3.9	8.8
Notes [Member] | Year To Date [Member]
Total		0.3
Cash-basis		0.3
Notes [Member]
Recorded investment	75.0	84.0
Unpaid principal face	75.0	85.2
Related allowance	58.5	55.8
Average recorded investment	79.5	87.6
Quarter To Date [Member]
Total		0.2
Year To Date [Member]
Total		1.0
Cash-basis		$ 0.3