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Stock Compensation Plans: Summary of MRDP Shares Vested (Details) - MRDP - Stock Grants - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares vested 0 3,254 6,207
Aggregate vesting date fair value   $ 30,000 $ 38,000