Earnings Per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Earnings per share - Basic [Abstract]
Net earnings	$ 5,268,900	$ 3,540,200	$ 9,475,400	$ 8,114,400
Less: Distributed and undistributed earnings allocated to nonvested stock	(59,000)	(51,000)	(106,000)	(118,000)
Earnings available to common shareholders - Basic	5,210,000	3,489,000	9,369,000	7,996,000
Weighted average common shares outstanding - Basic (in shares)	7,935	7,640	7,901	7,609
Earnings per common share - Basic (in dollars per share)	$ 0.66	$ 0.46	$ 1.19	$ 1.05
Earnings per share - Diluted [Abstract]
Net earnings	5,268,900	3,540,200	9,475,400	8,114,400
Less: Distributed and undistributed earnings allocated to nonvested stock	(58,000)	(50,000)	(88,000)	(103,000)
Earnings available to common shareholders - Diluted	$ 5,211,000	$ 3,490,000	$ 9,387,000	$ 8,011,000
Weighted average common shares outstanding - Basic (in shares)	7,935	7,640	7,901	7,609
Effect of dilutive options (in shares)	228	302	256	298
Weighted average common shares outstanding - Diluted (in shares)	8,253	7,942	8,157	7,907
Earnings per common share - Diluted (in dollars per share)	$ 0.64	$ 0.44	$ 1.15	$ 1.01
Anti-dilutive equity awards not included above (in shares)	0	0	0	0