Retirement Plans - Benefit obligation and funded status (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 27, 2022	Aug. 28, 2021	Aug. 27, 2022	Aug. 28, 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	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	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	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Defined Benefit Pension Plan
Change in benefit obligations:
Service cost	$ 107	$ 128	$ 214	$ 256
Interest cost	1,263	1,232	2,527	2,464
Expected return on plan assets	(1,402)	(1,313)	(2,804)	(2,626)
Amortization of unrecognized net loss		123		246
Net periodic pension expense	(32)	$ 170	(63)	$ 340
Change in plan assets:
Employer contributions	0		0
Expected employer contribution during next fiscal year	$ 0		$ 0