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Leases - Property leased or held for lease (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
[RealEstateGrossAtCarryingValue] $ 262,564 $ 241,253 $ 225,630 $ 221,585
Less accumulated depreciation and depletion 110,681 104,942    
[RealEstateInvestmentPropertyNet] 3,640 6,848    
Property leased or held for lease
       
Construction aggregates property 35,087      
Commercial property 224,922      
[RealEstateGrossAtCarryingValue] 260,009      
Less accumulated depreciation and depletion 58,332      
[RealEstateInvestmentPropertyNet] $ 201,677