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Stock Incentive and Purchase Plans (Schedule of Performance-Based and Market-Based Restricted Stock and Restricted Stock Units Activity Rollforward) (Details) (Performance-based restricted stock and restricted stock unit and market-based awards [Member], USD $)
3 Months Ended
Jul. 26, 2013
Performance-based restricted stock and restricted stock unit and market-based awards [Member]
 
Non-vested shares, beginning of year 396,161
Vested, shares (62,520)
Non-vested shares, end of year 333,641
Weighted Average Grant Date Fair Value, beginning of year $ 25.54
Weighted Average Grant Date Fair Value, Vested $ 27.13
Weighted Average Grant Date Fair Value, end of year $ 25.24