Income Taxes - Reconcilliation of Effective Income Tax Rate (Details)	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%		35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	0.70%		0.40%	0.60%
State income taxes, net of federal income tax benefit	0.40%		(1.50%)	2.70%
Benefit of Section 199 of the Code, manufacturing deduction	2.30%		2.70%	2.40%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%		(1.20%)	(3.40%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(1.80%)	0.00%	0.00%
Other	0.00%		0.00%	(0.50%)
Effective income tax rate	28.10%		26.40%	27.90%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(3.10%)		(3.20%)	(3.40%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(0.80%)		(0.40%)	(0.70%)