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Business Combinations - Consideration Related to Fiscal 2013 Acquisitions (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Business Acquisition [Line Items]      
Cash $ 106.9    
Equity 1.2 0 3.3
Total purchase price $ 108.1