Pension Plan - Summary of Pension Expense Composed of Components Included in Cost of Goods Sold and Selling, General and Administrative Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Components of net periodic benefit cost
Service cost	$ 1,106	$ 1,083	$ 1,166
Interest cost	2,274	2,270	2,372
Expected return on plan assets	(4,109)	(3,794)	(3,665)
Amortization of:
Unrecognized net loss	2,047	2,041	2,683
Net periodic benefit cost	1,318	1,600	2,556
Other changes in Plan Assets and Projected Benefit Obligation Recognized in Other comprehensive Income
Net actuarial loss (gain)	2,414	(669)	(723)
Amortization of net actuarial loss	(2,047)	(2,041)	(2,683)
Net of recognized in Other comprehensive Income	367	(2,710)	(3,406)
Total recognized in net periodic pension cost and other comprehensive income	$ 1,685	$ (1,110)	$ (850)