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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, unless otherwise specified
 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Components of net periodic benefit cost      
Service cost $ 1,262 $ 1,283 $ 1,214
Interest cost 2,402 2,402 2,523
Expected return on plan assets (3,490) (3,208) (3,214)
Amortization of:      
Prior service cost (145) (145) (145)
Unrecognized net loss 2,052 1,823 1,262
Net periodic benefit cost 2,081 2,155 1,640
Recognized in Other comprehensive Income      
Net actuarial loss (gain) (4,600) 4,370 7,923
Amortization of net actuarial loss (2,052) (1,823) (1,262)
Amortization of prior service credit 145 145 145
Net of recognized in Other comprehensive Income 3,976 (1,667) (4,004)
Total recognized in net periodic pension cost and other comprehensive income $ (4,426) $ 4,847 $ 8,446