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Taxes (Schedule of Income Tax Rate) (Details) | 12 Months Ended
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Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Taxes [Abstract] |  |  |
U.S. statutory tax rate | 33.80% | 35.00% | 35.00%
U.S. state income taxes, net of federal income tax benefit | 1.80% | 1.70% | 1.80%
Transition tax on accumulated foreign earnings | 12.30% | 0.00% | 0.00%
Deferred tax benefit from change in tax rate | (14.10%) | 0.00% | 0.00%
Income taxed outside the U.S. | (4.10%) | (4.50%) | (4.00%)
Net impact of repatriated international earnings | (0.10%) | (1.00%) | 0.10%
Other, net | 0.80% | (0.90%) | (2.60%)
Effective income tax rate | 30.40% | 30.30% | 30.30%

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