Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 27, 2016	Aug. 29, 2015	Aug. 27, 2016	Aug. 29, 2015
Defined Benefit Pension Plan
Net periodic pension expense
Service cost	$ 292	$ 513	$ 584	$ 1,025
Interest cost	1,621	1,634	3,242	3,267
Expected return on plan assets	(1,142)	(1,593)	(2,284)	(3,186)
Amortization of unrecognized prior service cost		18		34
Amortization of unrecognized net loss	1,132	978	2,264	1,957
Net pension expense	1,903	1,550	3,806	3,097
Employer contributions	0		0
Expected employer contribution during the remainder of fiscal year			0
Nonqualified Executive Retirement Plans
Net periodic pension expense
Interest cost	109	119	218	237
Net pension expense	109	$ 119	218	$ 237
Employer contributions	$ 387		749
Expected employer contribution during the remainder of fiscal year			$ 754