Income Taxes (Components and Provision for Income Taxes) (Details) (USD $)	12 Months Ended
	Apr. 26, 2013		Apr. 27, 2012		Apr. 29, 2011
Income before income taxes:
Domestic	$ 74,949,502		$ 63,865,045		$ 50,330,220
Foreign	325,123		(3,443,617)		(1,665,289)
Income before income taxes	75,274,625		60,421,428		48,664,931
Provision for current income tax expense:
Federal, current	13,987,217		779,690		242,547
State and local, current	1,692,119		772,013		530,089
Foreign, current	101,281		125,738		64,822
Current income tax expense	15,780,617		1,677,441		837,458
Provision for deferred income tax expense:
Federal	13,066,858		21,583,269		18,254,023
State and local	69,648		1,082,986		9,804
Discrete items	0	[1]	0	[1]	(17,162,064)	[1]
Deferred income tax expense	13,136,506		22,666,255		1,101,763
Total provision for income tax expense	$ 28,917,123		$ 24,343,696		$ 1,939,221

[1] The discrete items in fiscal year 2011 were primarily, (i) a worthless stock deduction and (ii) the release of valuation allowance against our deferred tax assets, which resulted in fully releasing the valuation allowance against our regular net operating loss carryforward. The following is a reconciliation of the statutory federal income tax rate to our effective income tax rate expressed as a percentage of income before income taxes: