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Retirement Plan and Incentive Awards - Schedule of Nonvested Stock Awards and Performance Shares (Details) (Nonvested Stock Awards and Performance Shares, USD $)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Nonvested Stock Awards and Performance Shares
     
Shares [Roll Forward]      
Beginning of period 323,335 288,079 367,997
Granted 99,413 179,913 150,853
Vested (126,124) (88,497) (82,740)
Returned 0 0 [1] 10,502
Forfeited (16,208) (56,160) (137,529)
End of period 280,416 323,335 288,079
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period $ 19.61 $ 33.85 $ 72.05
Granted $ 10.95 $ 7.19 $ 23.45
Vested $ 27.59 $ 34.20 $ 104.70
Returned $ 0.00 $ 0.00 [1] $ 342.80
Forfeited $ 30.57 $ 29.97 $ 58.50
End of period $ 12.32 $ 19.61 $ 33.85
[1] (a) Our former Chief Executive Offer returned 10,502 shares of unvested restricted stock in accordance with his consent agreement with the Securities and Exchange Commission.