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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, 2012
Sep. 30, 2011
Sep. 30, 2010
Nonvested Stock Awards and Performance Shares
     
Shares [Roll Forward]      
Beginning of period 288,079 367,997 225,376
Granted 179,913 150,853 201,229
Vested (88,497) (82,740) (40,303)
Returned 0 (10,502) [1] 0
Forfeited (56,160) (137,529) (18,305)
End of period 323,335 288,079 367,997
Weighted-Average Grant Date Fair Value ($ per share) [Roll Forward]      
Beginning of period $ 33.85 $ 72.05 $ 138.30
Granted $ 7.19 $ 23.45 $ 28.45
Vested $ 34.20 $ 104.70 $ 166.05
Returned $ 0.00 $ 342.80 [1] $ 0.00
Forfeited $ 29.97 $ 58.50 $ 201.95
End of period $ 19.61 $ 33.85 $ 72.05
[1] (a) Our former Chief Executive Offer returned 10,502 shares of unvested restricted stock in accordance with this agreement with the Securities and Exchange Commission.