Commitments and Contingencies (Details 2) (USD $)		3 Months Ended	6 Months Ended		12 Months Ended			1 Months Ended	6 Months Ended	3 Months Ended	12 Months Ended	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011 Legal Matters	Mar. 31, 2012 Legal Matters	Mar. 31, 2011 Legal Matters	Sep. 30, 2010 Boynton plaintiff	Sep. 30, 2009 Boynton plaintiff	Apr. 30, 2011 Boynton	Feb. 29, 2012 Fentress Families Trust defendant plaintiff	Mar. 31, 2012 Neil Wallace	Dec. 31, 2011 Oxford Mining Company	Sep. 30, 2008 Archstone building	Mar. 31, 2012 Repair cost Archstone	Mar. 31, 2012 Lost lease payments Archstone	Mar. 31, 2012 Class action defense fees Archstone	Mar. 31, 2012 Tenant lawsuit against Archstone Archstone
Commitments and Contingencies
Long term capital commitments on property, plant and equipment	$ 600,000
Legal fees			1,200,000	15,800,000
Constructive trust amount ordered by trial court							16,000,000
Court ordered judgment							16,000,000
Litigation settlement, expense		15,000,000
Potential loss for unresolved matters			16,000,000			43,000,000
Verdict for damages			16,000,000		7,300,000	8,700,000			10,000,000
Loss contingency incurred		15,000,000
Loss contingency damages sought value										5,000,000		36,000,000	15,000,000	7,000,000	7,000,000
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 prejudgement interest, attorney fees and costs								55,000,000
Additional damages sought by other plaintiffs								$ 307,200,000