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Stock Compensation Plans: Summary of MRDP Shares Unvested (Details) - MRDP - Stock Grants - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested shares, beginning of period 0    
Shares vested 0 3,254 6,207
Unvested shares, end of period 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Unvested shares, beginning of period, Weighted Average Grant Date Fair Value $ 0.00    
Shares vested, Weighted Average Grant Date Fair Value 0.00    
Unvested shares, end of period, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00