Supplemental Cash Flow Information - Net Cash Flows from Operating Activities Reflect Cash Payments for Interest and Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 731	$ 853	$ 1,623
Income taxes paid	15,468	$ 975	$ 18,980
Reclassification of the income tax effects of the Tax Act for the pension plan	$ 2,847