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Stock Repurchase Program and Cash Dividend (Details Textual) - $ / shares
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Dec. 13, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Treasury Stock, Shares, Acquired   3,653,000 1,929,000 9,874,000 2,492,000  
Treasury Stock Acquired, Average Cost Per Share   $ 37.24 $ 39.02 $ 43.30 $ 36.40  
Dec 2017 Repurchase Program [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           20,000,000
May 2016 repurchase progam [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Treasury Stock, Shares, Acquired       3,097,000    
Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Treasury Stock, Shares, Acquired 978,000          
Treasury Stock Acquired, Average Cost Per Share $ 36.32