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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, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Components of net periodic benefit cost        
Service cost $ 326 $ 280 $ 651 $ 561
Interest cost 592 612 1,184 1,224
Expected return on plan assets (982) (964) (1,964) (1,928)
Amortization of:        
Prior service cost (22) (36) (43) (72)
Unrecognized net loss 637 381 1,275 762
Net periodic benefit cost $ 551 $ 273 $ 1,103 $ 547