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Debt - Senior Credit Agreement (Details)
12 Months Ended
Sep. 15, 2015
USD ($)
Jan. 26, 2019
USD ($)
Jan. 25, 2020
USD ($)
Oct. 19, 2018
USD ($)
Line of Credit Facility [Line Items]        
Letters of credit outstanding amount   $ 48,600,000 $ 52,300,000  
Line of Credit Facility, Remaining Borrowing Capacity   412,900,000 287,000,000.0  
Incremental Facility, Minimum        
Line of Credit Facility [Line Items]        
Debt instrument, face amount $ 350,000,000.0      
Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 200,000,000.0
Letters of credit outstanding amount     48,600,000  
0.75% Convertible Senior Notes Due 2021        
Line of Credit Facility [Line Items]        
Debt instrument, face amount $ 485,000,000.0 $ 485,000,000 $ 460,000,000.0  
Debt, interest rate (in percent)   0.75% 0.75%  
Outstanding Debt Credit Agreement Threshold     $ 250,000,000.0  
Credit Agreement Liquidity Requirement     150,000,000.0  
Minimum        
Line of Credit Facility [Line Items]        
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio   3.50    
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio   3.00    
Maximum        
Line of Credit Facility [Line Items]        
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio   1.00    
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio   1.00    
Credit Agreement - Term Loan (matures April 2020)        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       450,000,000.0
Unrestricted Cash and Cash Equivalents Credit Agreement Threshold     $ 50,000,000.0  
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio 2.25      
Credit Agreement - Revolving facility (matures April 2020)        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 450,000,000.0     $ 750,000,000.0