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Subsequent Event (Details) - $ / shares
Jul. 30, 2019
Apr. 30, 2019
Jan. 29, 2019
Oct. 31, 2018
Subsequent Event [Line Items]        
Quarterly cash dividend declared (usd per share)   $ 0.08 $ 0.08 $ 0.08
Subsequent event        
Subsequent Event [Line Items]        
Quarterly cash dividend declared (usd per share) $ 0.08