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Stock Repurchase Program and Cash Dividend (Details Textual) - $ / shares
1 Months Ended 3 Months Ended
Mar. 09, 2020
Jan. 31, 2020
Jan. 31, 2019
Dec. 19, 2019
Dec. 12, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Treasury Stock, Shares, Acquired   11,686,000 785,000    
Treasury Stock Acquired, Average Cost Per Share   $ 40.73 $ 32.02    
December 2018 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
December 2019 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  
Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Treasury Stock, Shares, Acquired 3,800,000        
Treasury Stock Acquired, Average Cost Per Share $ 37.52