Business and Summary of Significant Accounting Policies (Vendor Concentrations) (Details)	12 Months Ended
Jan. 31, 2019 Rate	Jan. 31, 2018 Rate	Jan. 31, 2017 Rate
Apple, Inc.
Concentration Risk
Concentration Risk, Percentage	16.00%	17.00%	21.00%
HP Inc.
Concentration Risk
Concentration Risk, Percentage	11.00%	11.00%	14.00%
Cisco Systems, Inc.
Concentration Risk
Concentration Risk, Percentage	11.00%	11.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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