Retirement Plans - Benefit obligation and funded status (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Estimated amounts that will be amortized from accumulated other comprehensive loss into net periodic pension expense
Net actuarial loss	$ 3,646
Prior service cost	0
Pension Plan
Change in benefit obligations:
Benefit obligation at end of prior year	150,705	$ 161,851
Service cost	462	597	$ 1,212
Interest cost	6,186	6,159	6,340
Distributions	(7,525)	(8,816)
Actuarial loss (gain)	29,076	(9,086)
Benefit obligation at end of year	178,904	150,705	161,851
Change in plan assets:
Fair value of plan assets at beginning of year	124,832	130,860
Employer contributions	0	2,715	9,023
Actual return on plan assets	14,823	72
Distributions (including expenses paid by the plan)	(7,525)	(8,815)
Fair value of plan assets at end of year	132,130	124,832	$ 130,860
Funded status	(46,774)	(25,873)
Amounts recognized in consolidated balance sheets consisted of:
Accrued pension liability	(46,774)	(25,873)
Net amount recognized in balance sheet	(46,774)	(25,873)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	(44,760)	(27,409)
Amount recognized in other comprehensive income	(44,760)	(27,409)
Estimated amounts that will be amortized from accumulated other comprehensive loss into net periodic pension expense
Accumulated benefit obligation	$ 178,904	$ 150,705