Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Deferred tax assets:
Employee benefit and incentive plans	$ 51,159	$ 60,082
Goodwill and other intangible assets	34,907	41,728
Net operating loss carryforwards	22,929	24,227
Reserves not currently deductible	19,596	19,382
Accrued expenses deductible as paid	10,764	9,187
Inventory costing	7,556	9,531
Foreign tax credit carryforwards	1,718	1,227
Deferred revenue	1,413	1,871
Deferred capital loss	1,391	1,407
Other (each less than 5 percent of total assets)	9,458	8,369
Deferred tax assets, Gross	182,656	201,330
Valuation allowance	(25,764)	(23,482)
Total deferred tax assets	156,892	177,848
Deferred tax liabilities:
Property, plant and equipment	44,236	48,123
Unrealized Investment Gain	10,160
Other	4,654	3,169
Total deferred tax liabilities	59,050	51,292
Net deferred tax assets	97,842	126,556
Section 382 [Member]
Deferred tax assets:
Net operating loss carryforwards	$ 21,765	$ 24,319