Income Taxes (Deferred Tax Assets Current and Non-Current) (Details) (USD $)	Apr. 26, 2013	Apr. 27, 2012
Income Taxes [Abstract]
Current deferred tax asset	$ 17,992,339	$ 27,971,835
Current valuation allowance	(7,622,378)	(10,663,030)
Non-current deferred tax asset	27,236,316	41,611,106
Non-current valuation allowance	(18,559,385)	(27,189,315)
Deferred tax assets	19,046,892	31,730,596
Current deferred tax liability	(71,969)	(314,596)
Non-current deferred tax liability	(851,646)	(156,217)
Deferred tax liabilities	(923,615)	(470,813)
Deferred Tax Assets, Net	$ 18,123,277	$ 31,259,783