Retirement Plans - Benefit obligation and funded status (Details) - USD ($) $ in Thousands	3 Months Ended
	May 28, 2022	May 29, 2021
Change in benefit obligations:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Defined Benefit Pension Plan
Change in benefit obligations:
Service cost	$ 107	$ 128
Interest cost	1,264	1,232
Expected return on plan assets	(1,402)	(1,313)
Amortization of unrecognized net loss		123
Net periodic pension expense	(31)	$ 170
Change in plan assets:
Employer contributions	0
Expected employer contribution during next fiscal year	$ 0