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, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Components of net periodic benefit cost
Service cost	$ 292	$ 325	$ 875	$ 976
Interest cost	593	592	1,779	1,776
Expected return on plan assets	(917)	(982)	(2,749)	(2,946)
Amortization of:
Prior service cost		(21)		(64)
Unrecognized net loss	671	638	2,012	1,913
Net periodic benefit cost	$ 639	$ 552	$ 1,917	$ 1,655