Pension Plan and Other Employee Benefits - 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, 2018	Feb. 28, 2017	Feb. 29, 2016
Components of net periodic benefit cost
Service cost	$ 1,083	$ 1,166	$ 1,301
Interest cost	2,270	2,372	2,369
Expected return on plan assets	(3,794)	(3,665)	(3,928)
Amortization of:
Prior service cost			(86)
Unrecognized net loss	2,041	2,683	2,551
Net periodic benefit cost	1,600	2,556	2,207
Other changes in Plan Assets and Projected Benefit Obligation Recognized in Other comprehensive Income
Net actuarial loss (gain)	(669)	(723)	2,102
Amortization of net actuarial loss	(2,041)	(2,683)	(2,551)
Amortization of prior service credit			86
Net of recognized in Other comprehensive Income	(2,710)	(3,406)	(363)
Total recognized in net periodic pension cost and other comprehensive income	$ (1,110)	$ (850)	$ 1,844