Income Taxes Reconciliations of Provision for Income Taxes at Statutory Federal Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Statutory Federal Income Tax Rate	33.80%	35.00%	35.00%
State income Taxes, net of Federal benefit	1.50%	2.20%	2.40%
Foreign Losses With No Tax Benefit	0.20%	0.20%	0.00%
Undistributed Foreign Earnings	(1.40%)	(2.30%)	(2.50%)
Net change in uncertain tax positions	0.20%	(0.70%)	0.50%
Domestic manufacturing deduction	(1.80%)	(0.90%)	(1.30%)
2017 Tax Act	19.80%	0.00%	0.00%
Other	(1.00%)	0.60%	0.60%
Effective Income Tax Rate Reconciliation, Percent	51.30%	34.10%	34.70%