Pension Plan and Other Employee Benefits - Plan's Fair Value Hierarchy for Assets Measured at Fair Value (Detail) - USD ($) $ in Thousands	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 56,884	$ 52,812	$ 47,547
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	893	3,105
Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	14,005	11,861
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	9,609	8,037
Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	25,558	24,777
Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	6,819	5,032
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	33,270	32,914
Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	893	3,105
Level 1 [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	25,558	24,777
Level 1 [Member] | Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	6,819	5,032
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	23,614	19,898
Level 2 [Member] | Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	14,005	11,861
Level 2 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 9,609	$ 8,037