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		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Components of net periodic benefit cost
Service cost	$ 268	$ 318	$ 537	$ 636
Interest cost	421	439	841	877
Expected return on plan assets	(930)	(1,018)	(1,861)	(2,037)
Amortization of:
Unrecognized net loss	640	839	1,280	1,679
Net periodic benefit cost	$ 399	$ 578	$ 797	$ 1,155