Commitments and Contingencies (Details 2) (USD $)		9 Months Ended				1 Months Ended	9 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Legal Matters [Member]	Jun. 30, 2013 Legal Matters [Member]	Sep. 30, 2014 Legal Matters [Member]	Sep. 30, 2011 Legal Matters [Member]	May 31, 2014 A E S Thames Bankruptcy [Member]	Jun. 30, 2014 A E S Thames Bankruptcy [Member]	May 31, 2014 Boynton [Member]	Sep. 30, 2010 Boynton [Member] item	Sep. 30, 2009 Boynton [Member] item	Apr. 30, 2011 Boynton [Member]	Feb. 29, 2012 Fentress Families Trust [Member] item	Sep. 30, 2010 Fentress Families Trust [Member] item	Dec. 31, 2012 C P M Virginia L L C [Member]	Jun. 30, 2014 Archstone [Member] item	Sep. 30, 2008 Archstone [Member] item	Jun. 30, 2014 Repair Cost [Member] Archstone [Member]	Jun. 30, 2014 Lost Lease Payments [Member] Archstone [Member]	Jun. 30, 2014 Tenant Lawsuit Against Archstone [Member] Archstone [Member]	Jun. 30, 2014 Class Action Defense Fees [Member] Archstone [Member]
Commitments and Contingencies
Long term capital commitments on property, plant and equipment	$ 5,700,000
Legal fees		4,500,000	1,800,000
Potential loss for unresolved matters		2,500,000								43,000,000
Total liability accrued		2,500,000		2,500,000	15,000,000
Settlement payment						25,000		16,200,000
Verdict for damages									7,300,000	8,700,000
Number of plaintiffs									46	8		383
Constructive trust amount ordered by trial court											16,000,000
Court ordered judgment											16,000,000
Number of defendants												15
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
Number of insurers who have denied coverage													2
Loss contingency damages sought value							$ 1,600,000							$ 500,000			$ 36,000,000	$ 19,000,000	$ 7,000,000	$ 7,000,000
Number of buildings																21
Number of claims															4
Number of claims dismissed															3