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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 21, 2016
Nov. 18, 2016
Oct. 31, 2016
Oct. 31, 2015
May 29, 2015
Dividends Payable [Line Items]          
Dividends paid per share (in usd per share)     $ 0.175 $ 0.170  
Number of shares authorized to be repurchased         14,000,000.0
Stock repurchased during the period (in shares)     1,100,000.0    
Stock repurchased during the period, value     $ 41.4    
Average price per share (in usd per share)     $ 36.59    
Shares with remaining authorization for repurchase under stock repurchase plan (in shares)     9,400,000.0    
Subsequent Event          
Dividends Payable [Line Items]          
Cash dividend declared per common share (in usd per share)   $ 0.175      
Scenario, Forecast          
Dividends Payable [Line Items]          
Dividends paid per share (in usd per share) $ 0.175