Quarterly Results of Operations (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 25, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 31, 2013	Apr. 01, 2012	Mar. 27, 2011
Summarized quarterly financial data [Abstract]
Revenues	$ 158,449,800	$ 204,458,700	$ 197,238,300	$ 192,418,200	$ 194,787,400	$ 226,250,100	$ 148,837,400	$ 163,515,000
Cost of goods sold	124,498,600	165,488,900	158,613,300	156,925,000	156,798,300	186,773,300	114,847,500	126,314,600
Gross profit	33,951,200	38,969,800	38,625,000	35,493,200	37,989,100	39,476,800	33,989,900	37,200,400	147,039,200	148,656,200	133,280,600
Selling, general and administrative expenses	29,144,900	30,226,300	29,887,000	28,562,400	32,221,100	31,596,300	28,159,900	29,675,100	117,820,600	121,652,400	117,305,100
Income from operations	4,806,300	8,743,500	8,738,000	6,930,800	5,768,000	7,880,500	5,830,000	7,525,300	29,218,600	27,003,800	15,975,500
Interest, net	141,100	13,700	12,000	57,400	41,000	73,500	72,900	105,500
Income before provision for income taxes	4,665,200	8,729,800	8,726,000	6,873,400	5,727,000	7,807,000	5,757,100	7,419,800	28,994,400	26,710,900	15,554,900
Provision for income taxes	1,745,400	3,331,100	3,457,100	2,666,900	2,178,100	3,033,400	2,216,900	2,845,600	11,200,500	10,274,000	5,536,700
Net income	2,919,800	5,398,700	5,268,900	4,206,500	3,548,900	4,773,600	3,540,200	4,574,200	17,793,900	16,436,900	10,018,200
Diluted earnings per share (in dollars per share)	$ 0.35	$ 0.65	$ 0.64	$ 0.51	$ 0.43	$ 0.59	$ 0.44	$ 0.57	$ 2.15	$ 2.03	$ 1.27
Cash dividends declared per common share (in dollars per share)	$ 0.18	$ 0.93	$ 0.18	$ 0.18	$ 0.15	$ 0.15	$ 0.15	$ 0.10	$ 1.47	$ 0.55	$ 0.40
Comprehensive income	$ 2,919,800	$ 5,398,700	$ 5,268,900	$ 4,206,500	$ 3,548,900	$ 4,773,600	$ 3,543,300	$ 4,595,700	$ 17,793,900	$ 16,461,500	$ 10,091,200