Income Taxes - Reconcilliation of Effective Income Tax Rate (Details)	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	32.70%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	0.50%	1.60%	0.70%
State income taxes, net of federal income tax benefit	0.40%	0.40%	0.40%
Benefit of Section 199 of the Code, manufacturing deduction	0.00%	(2.20%)	(2.30%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(0.70%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.50%	(0.50%)	(1.80%)
Other	0.00%	0.20%	0.10%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(4.10%)	(7.70%)	(3.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	1.10%	(0.40%)	(0.80%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	(78.90%)	0.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Percent	0.00%	8.60%	0.00%
Effective income tax rate	18.70%	(46.20%)	28.20%