Retirement Plans - Net periodic cost (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	May 30, 2020	Jun. 01, 2019
Net periodic pension expense
Service cost (credit)	$ 144	$ 143
Interest cost	1,199	1,556
Expected return on plan assets	(1,177)	(1,214)
Amortization of unrecognized net loss	911	415
Net periodic pension expense	$ 1,077	$ 900