Pension Plan - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 29, 2016	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Defined Benefit Plan Disclosure [Line Items]
Employees covered under noncontributory Pension Plan			20.00%
Compensation period preceding retirement and termination			5 years
Target asset allocation, historical period			10 years
Target asset allocation, expected returns			5 years
Expected rate of return	8.00%		7.50%	8.00%	8.00%
Expected contributions			$ 3,000,000	$ 3,000,000
Matching contributions			$ 1,200,000	1,200,000	$ 1,100,000
United States employees contribution			100.00%
Profit sharing contributions			$ 228,000	$ 229,000	$ 227,000
Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contributions		$ 3,000,000