Annual report pursuant to Section 13 and 15(d)

Stock Repurchase Program (Narrative) (Details)

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Stock Repurchase Program (Narrative) (Details) - shares
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2012
Jan. 17, 2007
Equity, Class of Treasury Stock [Line Items]          
Number of shares authorized to be repurchased         1,000,000
Total number of shares repurchased 2,183,704 2,183,454 2,014,454 1,958,829  
Maximum repurchases allowed under provision through calendar year 450,000        
Maximum repurchases allowed under provision annually per individual 50,000        
Maximum [Member]          
Equity, Class of Treasury Stock [Line Items]          
Number of shares authorized to be repurchased 3,000,000