Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 01, 2012	Aug. 27, 2011	Sep. 01, 2012	Aug. 27, 2011
Defined Benefit Pension Plan
Net periodic pension expense
Service cost	$ 867	$ 838	$ 1,735	$ 1,676
Interest cost	1,565	1,518	3,131	3,036
Expected return on plan assets	(1,749)	(1,505)	(3,498)	(3,010)
Amortization of unrecognized prior service cost	60	157	120	314
Amortization of unrecognized net loss (gains)	960	422	1,920	844
Net pension expense (income)	1,703	1,430	3,408	2,860
Change in plan assets:
Employer contributions	2,090		3,854
Expected employer contribution during the remainder of fiscal 2013	5,911		5,911
Nonqualified Executive Retirement Plan
Net periodic pension expense
Service cost		5		10
Interest cost	154	192	308	385
Net pension expense (income)	154	197	308	395
Change in plan assets:
Employer contributions	428		834
Expected employer contribution during the remainder of fiscal 2013	$ 821		$ 821