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
	May 30, 2014	May 31, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 144	$ 320
Interest cost	1,837	1,742
Expected return on plan assets	(1,623)	(1,574)
Amortization of prior service cost (credit)	1	51
Amortization of actuarial loss (gain)	706	917
Defined benefit plan, net periodic benefit cost, total	1,065	1,456
Postretirement Benefits Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	100	138
Interest cost	675	613
Expected return on plan assets	(700)	(763)
Amortization of prior service cost (credit)	(325)	(325)
Amortization of actuarial loss (gain)	(225)	(213)
Defined benefit plan, net periodic benefit cost, total	$ (475)	$ (550)