Note 3 - Receivables (Detail) - Impaired loans (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Sep. 30, 2011
Recorded investment	$ 37.5	$ 48.8
Contracts [Member] | Quarter To Date [Member]
Total		0.2
Contracts [Member] | Year To Date [Member]
Total		0.6
Contracts [Member]
Recorded investment	4.5	5.2
Unpaid principal face	4.3	5.1
Related allowance	1.6	2.8
Average recorded investment	4.9	8.8
Notes [Member] | Year To Date [Member]
Total		0.3
Cash-basis		0.3
Notes [Member]
Recorded investment	84.0	84.0
Unpaid principal face	85.2	85.2
Related allowance	55.8	55.8
Average recorded investment	84.0	87.6
Total [Member] | Quarter To Date [Member]
Total		0.2
Total [Member] | Year To Date [Member]
Total		0.9
Cash-basis		0.3
Total [Member]
Recorded investment	88.5	89.2
Unpaid principal face	89.5	90.3
Related allowance	57.4	58.6
Average recorded investment	$ 88.9	$ 96.4