Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis) (Details) (USD $)	3 Months Ended			9 Months Ended
	Jan. 25, 2013	Oct. 26, 2012	Jan. 27, 2012	Jan. 25, 2013 item	Jan. 27, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 1,450,000			$ 1,450,000
Cash settlement election for the first two groups (in Tranches)				40
Total settlement measurement period (in Duration)				60 days
Fair market value of first 40 tranches reclassed from common stock warrants to warrant liability				3,649,637
Gain on warrants' liability	(2,112)	2,321,951	0	1,325,574	0
Fair Value Assumptions, Risk Free Interest Rate				0.13%
Fair Value Assumptions, Expected Volatility Rate				25.00%
Forgone interest				0.2
Convertible debt security [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	1,450,000			1,450,000
Debt instrument, face amount	5,000,000			5,000,000
Debt instrument, issuance date				Aug. 18, 2010
Fair Value Inputs Level 1 [Member] | Convertible debt security [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0			0
Fair Value Inputs Level 2 [Member] | Convertible debt security [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0			0
Fair Value Inputs Level 3 [Member] | Convertible debt security [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 1,450,000			$ 1,450,000