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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
May 31, 2017
May 31, 2016
Components of net periodic benefit cost    
Service cost $ 271 $ 291
Interest cost 568 593
Expected return on plan assets (949) (916)
Amortization of:    
Unrecognized net loss 510 671
Net periodic benefit cost $ 400 $ 639