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, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Components of net periodic benefit cost
Service cost	$ 292	$ 326	$ 583	$ 651
Interest cost	593	592	1,186	1,184
Expected return on plan assets	(916)	(982)	(1,832)	(1,964)
Amortization of:
Prior service cost		(22)		(43)
Unrecognized net loss	670	637	1,341	1,275
Net periodic benefit cost	$ 639	$ 551	$ 1,278	$ 1,103