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, 2015	May. 31, 2014
Components of net periodic benefit cost
Service cost	$ 325	$ 281
Interest cost	592	612
Expected return on plan assets	(982)	(964)
Amortization of:
Prior service cost	(21)	(36)
Unrecognized net loss	638	381
Net periodic benefit cost	$ 552	$ 274