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Convertible Senior Notes, Warrants, and Hedges (Hedge and Warrant Transactions) (Details) - JPMorgan Chase Bank, National Association
$ / shares in Units, $ in Millions
6 Months Ended
Nov. 03, 2015
USD ($)
$ / option
Oct. 29, 2015
USD ($)
Oct. 02, 2016
USD ($)
$ / shares
Initial Bond Hedge      
Derivative [Line Items]      
Payments for hedge   $ 81.9 $ 94.2
Bond hedge strike price (usd per share) | $ / option 33.45    
Initial Warrant Transaction      
Derivative [Line Items]      
Proceeds from issuance of warrants $ 7.4 $ 49.4 $ 56.8
Initial strike price of warrants (usd per share) | $ / shares     $ 48.66
Additional Bond Hedge      
Derivative [Line Items]      
Payments for hedge $ 12.3