Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Feb. 28, 2013
Deferred tax assets:
Employee benefit and incentive plans	$ 59,225	$ 63,889
Goodwill and other intangible assets	32,724	39,327
Reserves not currently deductible	25,189	21,798
Net operating loss carryforwards	24,067	26,255
Inventory costing	7,243	3,546
Foreign tax credit carryforwards	6,137	15,177
Accrued expenses deductible as paid	5,882	11,713
Deferred capital loss	2,985	4,309
Deferred revenue	2,154	2,439
Other (each less than 5 percent of total assets)	10,859	10,042
Deferred tax assets, Gross	198,644	215,136
Valuation allowance	(29,318)	(16,713)
Total deferred tax assets	169,326	198,423
Deferred tax liabilities:
Property, plant and equipment	53,837	47,744
Other	2,235	5,877
Total deferred tax liabilities	56,072	53,621
Net deferred tax assets	113,254	144,802
Section 382 [Member]
Deferred tax assets:
Net operating loss carryforwards	$ 22,179	$ 16,641