Note 3 - Receivables (Detail) - Age Analysis of Recorded Investment (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Sep. 30, 2012
Past Due:
Grand total	$ 412.4		$ 430.3
Age Analysis, Contracts [Member]
Past Due:
1-29 days	6.6		6.6
30-59 days	5.5		6.0
60-89 days	3.8		1.4
Over 90 days	10.9		6.3
Total past due	26.8		20.3
Total current (2)	278.6		288.1
Grand total	305.4		308.4
Over 90 days and accruing interest	0.8		1.4
Nonaccrual status (not accruing interest)	22.2		13.8
Age Analysis, Notes [Member]
Past Due:
1-29 days	1.4
30-59 days	1.4		1.4
60-89 days	1.4		1.4
Over 90 days	46.6		40.0
Total past due	50.8		42.8
Total current (2)	56.2		79.1
Grand total	107.0		121.9
Over 90 days and accruing interest	0.1		0.3
Nonaccrual status (not accruing interest)	75.0		75.0
Age Analysis, Total [Member]
Past Due:
1-29 days	8.0		6.6
30-59 days	6.9		7.4
60-89 days	5.2		2.8
Over 90 days	57.5		46.3
Total past due	77.6		63.1
Total current (2)	334.8	[1]	367.2	[1]
Grand total	412.4		430.3
Over 90 days and accruing interest	0.9		1.7
Nonaccrual status (not accruing interest)	$ 97.2		$ 88.8

[1] includes impaired Alabama notes of $27.5 at March 31, 2013 and $35.0 at September 30, 2012.