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, 2016	May 31, 2015
Components of net periodic benefit cost
Service cost	$ 291	$ 325
Interest cost	593	592
Expected return on plan assets	(916)	(982)
Amortization of:
Prior service cost		(21)
Unrecognized net loss	671	638
Net periodic benefit cost	$ 639	$ 552