Investments (Details Textual) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Dec. 28, 2013	Dec. 28, 2013 Common stock of industrial and other companies [Member]	Mar. 30, 2013 Common stock of industrial and other companies [Member]	Dec. 28, 2013 Common stock of bank trust, insurance, and public utility companies [Member]	Mar. 30, 2013 Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value			$ 4,200,000	$ 3,700,000	$ 1,400,000	$ 1,600,000
Total unrealized losses			54,000	51,000	18,000	(17,000)
Investments (Textual) [Abstract]
Value of investments to be other-than-temporarily impaired		0
Gross gains realized	231,000	695,000
Gross losses realized	$ (56,000)	$ (140,000)