Pension And Other Postretirement Benefits (Net Benefit Cost Of Pension And Postretirement Benefit Plans) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Pension Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 531	$ 599	$ 1,723	$ 1,856
Interest cost	4,387	4,239	12,973	12,817
Expected return on Plan assets	(5,160)	(4,543)	(15,003)	(12,559)
Net amortization and deferral	987	1,028	3,018	3,027
Net benefit cost	745	1,323	2,711	5,141
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	(37)	138	359	518
Interest cost	441	427	1,541	1,732
Net amortization and deferral	(172)	(184)	(34)	78
Net benefit cost	$ 232	$ 381	$ 1,866	$ 2,328