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		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Components of net periodic benefit cost
Service cost	$ 318	$ 272	$ 954	$ 816
Interest cost	438	564	1,315	1,691
Expected return on plan assets	(1,019)	(1,049)	(3,056)	(3,148)
Amortization of:
Unrecognized net loss	840	509	2,519	1,527
Net periodic benefit cost	$ 577	$ 296	$ 1,732	$ 886