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Pension Plan - Plan's Fair Value Hierarchy for Assets Measured at Fair Value (Detail) - USD ($) $ in Thousands | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | $ 52,812 | $ 47,547 | $ 50,993
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 3,105 | 3,576 |
Government Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 11,861 | 10,887 |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 8,037 | 7,134 |
Domestic Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 24,777 | 20,226 |
Foreign Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 5,032 | 5,724 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 32,914 | 29,526 |
Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 3,105 | 3,576 |
Level 1 [Member] | Domestic Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 24,777 | 20,226 |
Level 1 [Member] | Foreign Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 5,032 | 5,724 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 19,898 | 18,021 |
Level 2 [Member] | Government Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | 11,861 | 10,887 |
Level 2 [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value Measurements | $ 8,037 | $ 7,134 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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