Income Taxes Reconciliations of Provision for Income Taxes at Statutory Federal Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Statutory Federal Income Tax Rate	35.00%	35.00%	35.00%
State income Taxes, net of Federal benefit	2.20%	2.40%	2.80%
Foreign Losses With No Tax Benefit	0.20%	0.00%	0.70%
Undistributed Foreign Earnings	(2.30%)	(2.50%)	(4.20%)
Net change in uncertain tax positions	(0.70%)	0.50%	0.30%
Domestic manufacturing deduction	(0.90%)	(1.30%)	(1.30%)
Other	0.60%	0.60%	1.10%
Effective Income Tax Rate Reconciliation, Percent	34.10%	34.70%	34.40%