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Income Taxes - Statutory U.S. Federal Income Tax Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Income Tax Disclosure [Abstract]      
Statutory rate 21.00% 21.00% 32.70%
Provision for state income taxes, net of federal income tax benefit 2.50% 2.80% 2.80%
Domestic production activities deduction     (2.80%)
Change in valuation allowance 0.80%    
Federal true-up 0.90% 0.40% 4.10%
Tax Cuts and Jobs Act     (7.60%)
Other 0.10% 0.80% 1.00%
Total 25.30% 25.00% 30.20%