Pension Plan - Pension Plan's Fair Value Hierarchy for Assets Measured at Fair Value (Detail) - USD ($) $ in Thousands	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 57,721	$ 56,884	$ 52,812
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	3,945	893
Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	16,128	14,005
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	10,722	9,609
Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	20,903	25,558
Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	6,023	6,819
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	30,871	33,270
Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	3,945	893
Level 1 [Member] | Domestic Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	20,903	25,558
Level 1 [Member] | Foreign Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	6,023	6,819
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	26,850	23,614
Level 2 [Member] | Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	16,128	14,005
Level 2 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Measurements	$ 10,722	$ 9,609