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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
3 Months Ended
Nov. 03, 2015
USD ($)
$ / option
Oct. 29, 2015
USD ($)
Jul. 01, 2018
USD ($)
$ / shares
Initial Bond Hedge      
Derivative [Line Items]      
Payments for hedge   $ 81.9 $ 94.2
Bond hedge strike price (in dollars 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 (in dollars per share) | $ / shares     $ 48.66
Additional Bond Hedge      
Derivative [Line Items]      
Payments for hedge $ 12.3