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, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Components of net periodic benefit cost
Service cost	$ 318	$ 272	$ 636	$ 544
Interest cost	439	563	877	1,127
Expected return on plan assets	(1,018)	(1,049)	(2,037)	(2,099)
Amortization of:
Unrecognized net loss	839	509	1,679	1,018
Net periodic benefit cost	$ 578	$ 295	$ 1,155	$ 590