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