Business and Summary of Significant Accounting Policies (Details) number in Millions	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Business and Summary of Significant Accounting Policies
Product Warranty Period	2 years
Other Intangible Assets | Minimum
Business and Summary of Significant Accounting Policies
Finite-Lived Intangible Asset, Useful Life	3 years
Other Intangible Assets | Maximum
Business and Summary of Significant Accounting Policies
Finite-Lived Intangible Asset, Useful Life	14 years
Capitalized software and development costs | Minimum
Business and Summary of Significant Accounting Policies
Finite-Lived Intangible Asset, Useful Life	3 years
Capitalized software and development costs | Maximum
Business and Summary of Significant Accounting Policies
Finite-Lived Intangible Asset, Useful Life	10 years
Customer Concentration Risk [Member]
Business and Summary of Significant Accounting Policies
Concentration Risk, Percentage	0.00%	0.00%	0.00%