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Subsequent Event (Details) - $ / shares
3 Months Ended
Apr. 30, 2019
Jun. 04, 2019
Jun. 03, 2019
Subsequent Event [Line Items]      
Dividend payable, date declared Jun. 04, 2019    
Dividend payable, date to be paid Jul. 10, 2019    
Dividend payable, date of record Jun. 20, 2019    
Subsequent Event      
Subsequent Event [Line Items]      
Dividend payable increase (percent)   5.00%  
Dividend payable (usd per share)   $ 0.58 $ 0.55