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Earnings Per Share (Schedule of Treasury Stock Shares Held for Deferred Compensation Included in Basic and Diluted Shares Outstanding) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share        
Weighted-average treasury stock shares held for deferred compensation obligations 185 202 181 201