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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 6 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2019
Aug. 31, 2018
Components of net periodic benefit cost        
Service cost $ 272 $ 276 $ 544 $ 553
Interest cost 563 569 1,127 1,137
Expected return on plan assets (1,049) (1,027) (2,099) (2,054)
Amortization of:        
Unrecognized net loss 509 512 1,018 1,023
Net periodic benefit cost $ 295 $ 330 $ 590 $ 659