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Shareholders' Equity (Narrative) (Details) - $ / shares shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Jan. 31, 2015 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Acquirement minimum of outstanding common stock |  |  |  |  |  |  | 15.00%
Redeemable value per each right |  |  |  |  |  |  | $ 0.001
Common stock authorized for repurchase | 14.0 |  |  |  |  |  | 14.0
Shares with remaining authorization for repurchase under stock repurchase plan | 13.0 |  |  |  |  |  | 13.0
Cash dividend declared per common share | $ .34 | $ .33 | $ 0.165 | $ 0.165 | $ 0.140 | $ 0.140 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, price per one one-thousandth preferred share | $ 143.00 |  |  |  |  |  | $ 143.00

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