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, unless otherwise specified	3 Months Ended
	May 31, 2014	May 31, 2013
Components of net periodic benefit cost
Service cost	$ 281	$ 315
Interest cost	612	601
Expected return on plan assets	(964)	(872)
Amortization of:
Prior service cost	(36)	(36)
Unrecognized net loss	381	512
Net periodic benefit cost	$ 274	$ 520