Pension Plan - Company's Pension Plan Asset Allocation, by Asset Category (Detail)	Feb. 28, 2019	Feb. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation by asset category	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation by asset category	46.00%	57.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation by asset category	48.00%	42.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation by asset category	6.00%	1.00%