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Stock Incentive and Purchase Plans (Details) (USD $)	12 Months Ended
Stock Incentive and Purchase Plans (Details) (USD $)	Apr. 26, 2013	Apr. 27, 2012	Apr. 29, 2011
Stock Incentive and Purchase Plans [Abstract]
Stock based incentive plans, shares authorized for issuance	19,550,000
Non-compensatory ESPP, shares authroized	950,000
Non-compensatory ESPP, shares available for issuance	400,288	402,033
Maximum payroll deduction for ESPP (in Percent)	15.00%
Percent of market value eligible employees can purchase common stock (in Percent)	95.00%
Stock-based compensation	$ 11,683,249	$ 11,102,237	$ 6,365,003

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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