Pension Plan and Other Employee Benefits - Schedule of Accumulated Benefit Obligation, Change in PBO, Change in Plan Assets, Funded Status, and Reconciliation to Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Change in benefit obligation
Projected benefit obligation at beginning of year	$ 57,658	$ 56,243
Service cost	1,083	1,166	$ 1,301
Interest cost	2,270	2,372	2,369
Actuarial loss	978	2,479
Other assumption change	(423)	(730)
Benefits paid	(3,947)	(3,872)
Projected benefit obligation at end of year	57,619	57,658	56,243
Change in plan assets:
Fair value of plan assets at beginning of year	52,812	47,547
Company contributions	3,000	3,000
Gain on plan assets	5,019	6,137
Benefits paid	(3,947)	(3,872)
Fair value of plan assets at end of year	56,884	52,812	$ 47,547
Unfunded status	(735)	(4,846)
Accumulated benefit obligation at end of year	$ 53,244	$ 53,590