Retirement Benefits - Components of Net Periodic Benefit Cost for Corporation's Defined Benefit Pension and Postretirement Benefits Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 27, 2015	Nov. 28, 2014	Nov. 27, 2015	Nov. 28, 2014
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 231	$ 144	$ 549	$ 433
Interest cost	1,542	1,833	4,650	5,516
Expected return on plan assets	(1,622)	(1,617)	(4,949)	(4,868)
Amortization of prior service cost (credit)	1	582	3	584
Amortization of actuarial loss (gain)	861	710	2,555	2,136
Defined benefit plan, net periodic benefit cost, total	1,013	1,652	2,808	3,801
Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	76	251	276
Interest cost	471	559	1,521	1,909
Expected return on plan assets	(665)	(762)	(2,015)	(2,162)
Amortization of prior service cost (credit)	(174)	(328)	(524)	(978)
Amortization of actuarial loss (gain)	(676)	(626)	(1,276)	(1,076)
Defined benefit plan, net periodic benefit cost, total	$ (1,043)	$ (1,081)	$ (2,043)	$ (2,031)