Unaudited Consolidated Statements of Income and Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Unaudited Consolidated Statements of Income and Comprehensive Income [Abstract]
Revenues	$ 197,238,300	$ 148,837,400	$ 389,656,500	$ 312,352,400
Cost of goods sold	158,613,300	114,847,500	315,538,300	241,162,100
Gross profit	38,625,000	33,989,900	74,118,200	71,190,300
Selling, general and administrative expenses	29,887,000	28,159,900	58,449,400	57,835,000
Income from operations	8,738,000	5,830,000	15,668,800	13,355,300
Interest, net	12,000	72,900	69,400	178,400
Income before provision for income taxes	8,726,000	5,757,100	15,599,400	13,176,900
Provision for income taxes	3,457,100	2,216,900	6,124,000	5,062,500
Net income	5,268,900	3,540,200	9,475,400	8,114,400
Basic earnings per share (in dollars per share)	$ 0.66	$ 0.46	$ 1.19	$ 1.05
Diluted earnings per share (in dollars per share)	$ 0.64	$ 0.44	$ 1.15	$ 1.01
Cash dividends declared per common share (in dollars per share)	$ 0.18	$ 0.15	$ 0.36	$ 0.25
Comprehensive income	$ 5,268,900	$ 3,543,300	$ 9,475,400	$ 8,139,000