Income Taxes - Reconciliations of Provision for Income Taxes at Statutory Federal Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	21.00%	21.00%	33.80%
State income taxes, net of Federal benefit	1.40%	1.50%	1.50%
Foreign losses with no tax benefit	0.00%	0.00%	0.20%
Effect of Foreign Operations	1.80%	1.10%	(1.40%)
Net change in uncertain tax positions	1.10%	(0.40%)	0.20%
Domestic manufacturing deduction	0.00%	0.00%	(1.80%)
Foreign Derived Intangible Income deduction	(4.00%)	(2.60%)	0.00%
Impact of the 2017 Tax Act	0.00%	1.30%	19.80%
Other	0.30%	(0.80%)	(1.00%)
Effective income tax rate reconciliation	21.60%	21.10%	51.30%