Income Taxes - Statutory U.S. Federal Income Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Provision for state income taxes, net of Federal income tax benefit	3.50%	3.10%	3.50%
Domestic production activities deduction	(2.50%)	(2.50%)	(2.50%)
Valuation allowance	(3.40%)	0.70%
Other	1.40%	0.50%	0.70%
Total	34.00%	36.80%	36.70%