Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Sep. 27, 2015	Sep. 27, 2014	Sep. 27, 2015	Sep. 27, 2014
Consolidated Statements of Income [Abstract]
Revenues	$ 142,353,300	$ 148,521,800	$ 277,017,300	$ 301,468,100
Cost of goods sold	108,491,600	113,085,800	210,919,700	230,783,300
Gross profit	33,861,700	35,436,000	66,097,600	70,684,800
Selling, general and administrative expenses	29,215,400	29,569,400	58,591,800	58,745,800
Income from operations	4,646,300	5,866,600	7,505,800	11,939,000
Interest expense, net	47,100	49,400	93,400	77,800
Income before provision for income taxes	4,599,200	5,817,200	7,412,400	11,861,200
Provision for income taxes	1,850,900	2,303,600	2,968,800	4,676,200
Net income	$ 2,748,300	$ 3,513,600	$ 4,443,600	$ 7,185,000
Basic earnings per share (in dollars per share)	$ 0.33	$ 0.42	$ 0.54	$ 0.87
Diluted earnings per share (in dollars per share)	0.33	0.42	0.54	0.86
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0.40	$ 0.40