Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012
Deferred tax assets:
Employee benefit and incentive plans	$ 63,889	$ 65,897
Goodwill and other intangible assets	52,054	56,720
Net operating loss carryforwards	26,255	26,185
Reserves not currently deductible	24,271	27,675
Foreign tax credit carryforwards	15,177	25,957
Accrued expenses deductible as paid	11,713	5,473
Deferred capital loss	4,309	2,124
Inventory costing	4,287	2,194
Deferred revenue	2,439	6,501
Other (each less than 5 percent of total assets)	10,042	13,412
Deferred tax assets, Gross	214,436	232,138
Valuation allowance	(16,713)	(14,504)
Total deferred tax assets	197,723	217,634
Deferred tax liabilities:
Property, plant and equipment	47,744	37,640
Other	5,177	2,402
Total deferred tax liabilities	52,921	40,042
Net deferred tax assets	$ 144,802	$ 177,592