Retirement Plans - Net periodic cost (Details) - Defined Benefit Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Mar. 04, 2023	Feb. 26, 2022	Feb. 27, 2021
Net periodic pension expense
Service cost	$ 336	$ 425	$ 486
Interest cost	5,036	4,861	4,753
Expected return on plan assets	(4,998)	(5,194)	(4,614)
Amortization of unrecognized net loss		(344)	(3,749)
Net periodic pension expense (income)	374	436	4,374
Employer contributions	0	1,700	6,305
Expected employer contribution during the remainder of fiscal year	0
Other changes recognized in other comprehensive loss:
Unrecognized net gain arising during period	(585)	(8,246)	(20,633)
Amortization of unrecognized net (loss) gain		(344)	(3,749)
Net amount recognized in other comprehensive loss	(585)	(8,590)	(24,382)
Net amount recognized in pension expense and other comprehensive loss	$ (211)	$ (8,154)	$ (20,008)