XML 17 R59.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
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, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Components of net periodic benefit cost        
Service cost $ 272 $ 277 $ 816 $ 830
Interest cost 564 568 1,691 1,705
Expected return on plan assets (1,049) (1,028) (3,148) (3,082)
Amortization of:        
Unrecognized net loss 509 512 1,527 1,535
Net periodic benefit cost $ 296 $ 329 $ 886 $ 988