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Long-Term Debt (Narrative) (Description of 2.625% Notes, Series B) (Details) - USD ($)
12 Months Ended
Jan. 26, 2017
Dec. 31, 2016
Nov. 17, 2016
Mar. 22, 2013
Debt Instrument [Line Items]        
Long-term Debt   $ 3,806,800,000    
Equity amount of notes previously recorded to APIC reclassified to mezzanine equity   $ 32,900,000    
2.625% Notes, Series B [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate (as a percent)   2.625% 2.625%  
Debt instrument, convertible, conversion ratio (in shares)   95.2381    
Debt conversion, original debt amount   $ 1,000    
Conversion price per share (in dollars per share)   $ 10.50    
Period immediately following consecutive trading days (in business days)   5 days    
Threshold consecutive trading days   5 days    
Percentage of product of closing sale price of common stock and conversion rate (less than)   103.00%    
Long-term Debt     $ 356,900,000  
Equity amount of notes previously recorded to APIC reclassified to mezzanine equity   $ (32,900,000)    
2.625% Notes, Series B [Member] | Debt Exchange - 2013 [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate (as a percent)   2.625%   2.625%
Subsequent Event [Member] | 2.625% Notes, Series B [Member]        
Debt Instrument [Line Items]        
Payment for redemption and conversion of debt $ 445,000,000