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Subsequent Event (Details) - $ / shares
3 Months Ended 9 Months Ended
Feb. 12, 2020
Nov. 12, 2019
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Subsequent Event [Line Items]            
Cash dividends payable, declared date   Nov. 12, 2019        
Cash dividends declared per common share (in usd per share)   $ 0.11 $ 0.11 $ 0.11 $ 0.33 $ 0.33
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividends payable, declared date Feb. 12, 2020          
Cash dividends declared per common share (in usd per share) $ 0.11          
Cash dividend payable date May 22, 2020          
Cash dividends declared, record date May 08, 2020