Pension Plan - Schedule of Accumulated Benefit Obligation, Change in PBO, Change in Pension Plan Assets, Funded Status, and Reconciliation to Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Change in benefit obligation
Projected benefit obligation at beginning of year	$ 69,536,000	$ 57,141,000
Service cost	1,271,000	1,088,000	$ 1,106,000
Interest cost	1,754,000	2,254,000	2,274,000
Actuarial (gain) loss	(638,000)	12,853,000
Other assumption change	(347,000)	(549,000)
Benefits paid	(5,126,000)	(3,251,000)
Settlement	(432,000)
Projected benefit obligation at end of year	66,018,000	69,536,000	57,141,000
Change in plan assets:
Fair value of plan assets at beginning of year	60,600,000	57,721,000
Company contributions	0	3,000,000
Gain on plan assets	4,245,000	3,130,000
Benefits paid	(5,126,000)	(3,251,000)
Fair value of plan assets at end of year	59,719,000	60,600,000	$ 57,721,000
Unfunded status	(6,299,000)	(8,936,000)
Accumulated benefit obligation at end of year	$ 60,981,000	$ 63,340,000