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	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Components of net periodic benefit cost
Service cost	$ 1,166	$ 1,301	$ 1,122
Interest cost	2,372	2,369	2,447
Expected return on plan assets	(3,665)	(3,928)	(3,856)
Amortization of:
Prior service cost		(86)	(145)
Unrecognized net loss	2,683	2,551	1,524
Net periodic benefit cost	2,556	2,207	1,092
Other changes in Plan Assets and Projected Benefit Obligation Recognized in Other comprehensive Income
Net actuarial loss (gain)	(723)	2,102	11,224
Amortization of net actuarial loss	(2,683)	(2,551)	(1,524)
Amortization of prior service credit		86	145
Net of recognized in Other comprehensive Income	(3,406)	(363)	9,845
Total recognized in net periodic pension cost and other comprehensive income	$ (850)	$ 1,844	$ 10,937