Commitments and Contingencies (Details 5) (USD $)	3 Months Ended		12 Months Ended						1 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2012 Legal Matters	Sep. 30, 2011 Legal Matters	Sep. 30, 2010 Legal Matters	Sep. 30, 2010 Boynton item	Sep. 30, 2009 Boynton item	Apr. 30, 2011 Boynton	Feb. 29, 2012 Fentress Families Trust item	Sep. 30, 2012 Neil Wallace	Dec. 31, 2011 Oxford Mining Company	Sep. 30, 2012 Reechcraft	Sep. 30, 2008 Archstone item	Sep. 30, 2012 Repair cost Archstone	Sep. 30, 2012 Class action defense fees Archstone	Sep. 30, 2012 Tenant lawsuit against Archstone Archstone	Sep. 30, 2012 Lost lease payments Archstone
Commitments and Contingencies
Long term capital commitments on property, plant and equipment		$ 700,000
Legal fees			4,100,000	16,500,000	5,300,000
Constructive trust amount ordered by trial court								16,000,000
Court ordered judgment								16,000,000
Litigation settlement, expense	15,000,000			15,000,000
Potential loss for unresolved matters			18,000,000				43,000,000
Verdict for damages						7,300,000	8,700,000
Total liability accrued			18,000,000
Loss contingency incurred			2,000,000	15,000,000
Loss contingency damages sought value										10,000,000	5,000,000	3,100,000		36,000,000	7,000,000	7,000,000	15,000,000
Number of defendants									15
Number of buildings													21
Number of plaintiffs						46	8		383
Damages for removal and remediation of fly ash and water supply									850,000,000
Damages for vexation									1,900,000,000
Damages for others									8,000,000
Damages for properties plus prejudgment interest, attorney fees and costs									55,000,000
Additional damages sought by other plaintiffs									$ 307,200,000