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Transactions with Vulcan Materials Company - Revenues from Vulcan Materials Company (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Transportation $ 103,476 $ 97,801 $ 89,637
[Revenues] 127,514 120,106 111,338
Vulcan Materials Company
     
Transportation 5,249 3,036 2,407
Real estate 4,755 4,580 4,725
[Revenues] $ 10,004 $ 7,616 $ 7,132