Investments Investments (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0
Investments (Textual) [Abstract]
Gross gains realized	871,000	885,000
Gross losses realized	(254,000)	(320,000)
Common stock of industrial and other companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	5,400,000	4,700,000
Total unrealized losses	(85,000)	(64,000)
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	100,000	500,000
Total unrealized losses	$ (3,000)	$ (9,000)