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		9 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Components of net periodic benefit cost
Service cost	$ 325	$ 281	$ 976	$ 842
Interest cost	592	611	1,776	1,835
Expected return on plan assets	(982)	(964)	(2,946)	(2,892)
Amortization of:
Prior service cost	(21)	(36)	(64)	(108)
Unrecognized net loss	638	381	1,913	1,143
Net periodic benefit cost	$ 552	$ 273	$ 1,655	$ 820