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	3 Months Ended
	May 31, 2019	May 31, 2018
Components of net periodic benefit cost
Service cost	$ 272	$ 277
Interest cost	564	568
Expected return on plan assets	(1,050)	(1,027)
Amortization of:
Unrecognized net loss	509	511
Net periodic benefit cost	$ 295	$ 329