Note 4 - Receivables (Detail) - Credit Risk Profile by Internally Assigned Grade (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Sep. 30, 2011
Low	$ 87.8		$ 43.9
Medium	68.5		26.1
High (2)	274.0	[1]	294.9	[1]
Total recorded investment	430.3		364.9
Contracts [Member]
Low			43.9
Medium			25.8
High (2)			133.2	[1]
Total recorded investment			202.9
Notes [Member]
Medium			0.3
High (2)			161.7	[1]
Total recorded investment			162.0
Contracts [Member]
Low	87.8
Medium	68.3
High (2)	152.3	[1]
Total recorded investment	308.4
Notes [Member]
Medium	0.2
High (2)	121.7	[1]
Total recorded investment	$ 121.9

[1] includes impaired Alabama notes receivable of $75.0 million in 2012 and $84.0 million in 2011