Income Taxes - Reconcilliation of Effective Income Tax Rate (Details)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
Expenses not deductible for tax purposes	0.20%	0.30%	1.50%
State income taxes, net of federal income tax benefit	3.10%	3.60%	2.70%
Benefit of Section 199 of the Code, manufacturing deduction	(2.60%)	(2.80%)	(3.70%)
Other	0.20%	(0.10%)	0.90%
Effective income tax rate	35.90%	36.00%	36.40%