Retirement Benefits - Components of Periodic Benefit Cost for Corporation's Defined Benefit Pension and Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 29, 2013	Nov. 23, 2012	Nov. 29, 2013	Nov. 23, 2012
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 315	$ 386	$ 955	$ 1,053
Interest cost	1,766	1,864	5,244	5,547
Expected return on plan assets	(1,577)	(1,632)	(4,718)	(4,854)
Amortization of prior service cost (credit)	68	61	170	184
Amortization of actuarial loss (gain)	871	1,005	2,701	2,636
Defined benefit plan, net periodic benefit cost, total	1,443	1,684	4,352	4,566
Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	48	88	323	513
Interest cost	572	531	1,797	2,131
Expected return on plan assets	(775)	(893)	(2,300)	(2,573)
Amortization of prior service cost (credit)	(327)	(519)	(977)	(1,557)
Amortization of actuarial loss (gain)	(357)	(339)	(782)	(339)
Defined benefit plan, net periodic benefit cost, total	$ (839)	$ (1,132)	$ (1,939)	$ (1,825)