Note 3 - Receivables (Detail) - Age Analysis of Recorded Investment (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Sep. 30, 2011
Past Due:
Grand total	$ 423.0		$ 364.9
Age Analysis, Contracts [Member]
Past Due:
1-29 days	6.1		5.3
30-59 days	3.3		2.0
60-89 days	2.1		1.2
Over 90 days	6.0		6.3
Total past due	17.5		14.8
Total current (1)	267.7		188.1
Grand total	285.2		202.9
Over 90 days and accruing interest	1.5		2.6
Nonaccrual status (not accruing interest)	45.3		24.2
Age Analysis, Notes [Member]
Past Due:
1-29 days			2.0
30-59 days	1.4		1.8
60-89 days	1.4		1.8
Over 90 days	45.7		31.0
Total past due	48.5		36.6
Total current (1)	89.3		125.4
Grand total	137.8		162.0
Over 90 days and accruing interest	0.1		0.1
Nonaccrual status (not accruing interest)	84.8		84.0
Age Analysis, Total [Member]
Past Due:
1-29 days	6.1		7.3
30-59 days	4.7		3.8
60-89 days	3.5		3.0
Over 90 days	51.7		37.3
Total past due	66.0		51.4
Total current (1)	357.0	[1]	313.5	[1]
Grand total	423.0		364.9
Over 90 days and accruing interest	1.6		2.7
Nonaccrual status (not accruing interest)	$ 130.1		$ 108.2

[1] includes impaired Alabama notes of $37.5 at June 30, 2012 and $48.8 at September 30, 2011.