Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Declared Quarterly Cash Dividends on Common Stock (Details)

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Shareholders' Equity - Declared Quarterly Cash Dividends on Common Stock (Details) - $ / shares
Apr. 25, 2018
Jan. 31, 2018
Jul. 26, 2017
Jan. 26, 2017
Subsequent Event [Line Items]        
Dividends per share (in dollars per share)   $ 0.12 $ 0.12 $ 0.075
Subsequent Event        
Subsequent Event [Line Items]        
Dividends per share (in dollars per share) $ 0.12