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Statements of Cash Flows - Supplemental Cash Flows and Non Cash Investing and Financing Activities (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 26, 2013
Jul. 27, 2012
Non-cash Investing and Financing Activities:    
Reclassification of equity component of Convertible Notes $ 0 $ 62.6
Acquisition of property and equipment outstanding in accounts payable 17.7 27.4
Acquisition of software through long-term financing 10.6 0
Supplemental Cash Flow Information:    
Income taxes paid, net of refunds 19.1 16.2
Interest paid, net of capitalized interest $ 23.0 $ 11.2