Note 4 - Receivables (Detail) - Age Analysis of Recorded Investment (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Sep. 30, 2011
1-29 days	$ 6.6		$ 7.3
30-59 days	7.4		3.8
60-89 days	2.8		3.0
Over 90 days	46.3		37.3
Total past due	63.1		51.4
Total current (1)	367.2	[1]	313.5	[1]
Grand total	430.3		364.9
Over 90 days and accruing interest	1.7		2.7
Nonaccrual status (not accruing interest)	88.8		108.2
Age Analysis, Contracts [Member]
1-29 days	6.6		5.3
30-59 days	6.0		2.0
60-89 days	1.4		1.2
Over 90 days	6.3		6.3
Total past due	20.3		14.8
Total current (1)	288.1	[1]	188.1	[1]
Grand total	308.4		202.9
Over 90 days and accruing interest	1.4		2.6
Nonaccrual status (not accruing interest)	13.8		24.2
Age Analysis, Notes [Member]
1-29 days			2.0
30-59 days	1.4		1.8
60-89 days	1.4		1.8
Over 90 days	40.0		31.0
Total past due	42.8		36.6
Total current (1)	79.1	[1]	125.4	[1]
Grand total	121.9		162.0
Over 90 days and accruing interest	0.3		0.1
Nonaccrual status (not accruing interest)	$ 75.0		$ 84.0

[1] includes impaired Alabama notes of $35.0 million in 2012 and $48.8 million in 2011