Pension Plan - Plan's Fair Value Hierarchy for Assets Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 50,993	$ 49,424	$ 44,974
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	4,262	3,247
Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	10,642	10,713
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	8,154	7,695
Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	21,974	21,928
Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	5,961	5,841
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	32,197	31,016
Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	4,262	3,247
Level 1 [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	21,974	21,928
Level 1 [Member] | Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	5,961	5,841
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	18,796	18,408
Level 2 [Member] | Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	10,642	10,713
Level 2 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 8,154	$ 7,695