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Long-Term Debt (Details) - USD ($)
$ in Thousands
4 Months Ended 9 Months Ended 15 Months Ended 20 Months Ended
Jul. 21, 2016
Dec. 03, 2014
Jul. 21, 2016
Apr. 30, 2017
Apr. 30, 2016
Mar. 14, 2016
Jul. 21, 2016
Jan. 31, 2017
Jul. 31, 2016
Mar. 15, 2016
Line of Credit Facility [Line Items]                    
Maturity date     Mar. 15, 2021              
Debt issuance cost       $ 0 $ 165          
Minimum Liquidity       $ 851,700            
Scenario 1                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms 1       325.00%            
Note Agreement, Covenant Terms       325.00%            
Scenario 2                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms 1       350.00%            
Note Agreement, Covenant Terms       350.00%            
Scenario 3                    
Line of Credit Facility [Line Items]                    
Long-term Debt       50            
Scenario 4                    
Line of Credit Facility [Line Items]                    
Long-term Debt       75            
Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Maturity date     Dec. 03, 2019              
Note Purchase Agreement                    
Line of Credit Facility [Line Items]                    
Debt issuance cost             $ 3,400      
Debt issuance fees $ 2,000   $ 2,000       2,000      
Reduction of long term debt 1,400   $ 1,400       1,400      
Note Purchase Agreement | Senior Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument principal amount   $ 400,000                
Note Purchase Agreement | Senior Notes, Series A                    
Line of Credit Facility [Line Items]                    
Maturity date       Dec. 03, 2024            
Debt instrument principal amount   $ 100,000                
Debt instrument, interest rate   4.07%                
Note Purchase Agreement | Senior Notes, Series B                    
Line of Credit Facility [Line Items]                    
Maturity date       Dec. 03, 2026            
Debt instrument principal amount   $ 100,000                
Debt instrument, interest rate   4.19%                
Note Purchase Agreement | Senior Notes, Series C                    
Line of Credit Facility [Line Items]                    
Maturity date       Dec. 03, 2027            
Debt instrument, interest rate   4.25%                
Note Purchase Agreement | Senior Notes, Series D                    
Line of Credit Facility [Line Items]                    
Maturity date       Dec. 03, 2029            
Debt instrument principal amount   $ 100,000                
Senior Notes, Series D | Senior Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument, interest rate   4.35%                
Senior Notes, Series C | Senior Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument principal amount   $ 100,000                
Wells Fargo and Bank of America, N.A. | Line of Credit                    
Line of Credit Facility [Line Items]                    
Repayments of Lines of Credit 242,500                  
Wells Fargo and Bank of America, N.A. | Revolving Credit Facility | Line of Credit | Minimum                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage     0.15%              
Wells Fargo and Bank of America, N.A. | Revolving Credit Facility | Line of Credit | Maximum                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage     0.30%              
Wells Fargo and Bank of America, N.A. | Term Loan Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Quarterly amortization for term loan     $ 7,500              
Wells Fargo and Bank of America, N.A. | Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity   300,000                
Wells Fargo and Bank of America, N.A. | Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity   $ 300,000                
Wells Fargo and Bank of America, N.A. | Credit Agreement | Term Loan Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Quarterly amortization for term loan           $ 18,800        
Wells Fargo and Bank of America, N.A. | First Amendment To Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity                   $ 350,000
Line of Credit, Maximum Borrowing Capacity, Increase                   50,000
Wells Fargo and Bank of America, N.A. | First Amendment To Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity                   93,800
Outstanding borrowings                   $ 93,800
Wells Fargo and Bank of America, N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate     0.125%              
Wells Fargo and Bank of America, N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate     1.00%              
Wells Fargo and Bank of America, N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR Two | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate     1.125%              
Wells Fargo and Bank of America, N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR Two | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate     2.00%              
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A.                    
Line of Credit Facility [Line Items]                    
Maturity date       Jul. 21, 2021            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage       0.125%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage       0.20%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Line of Credit                    
Line of Credit Facility [Line Items]                    
Outstanding borrowings                 $ 238,000  
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Scenario 3                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms       50.0            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Scenario 4                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Covenant Terms       75.0            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Outstanding borrowings       $ 165,000            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Credit Agreement | Term Loan Facility                    
Line of Credit Facility [Line Items]                    
LIBOR variable interest rate       LIBOR rate of 0.99% plus an applicable margin of 1.25%.            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Second Amendment To Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Maximum borrowing capacity $ 500,000   $ 500,000       $ 500,000 $ 850,000    
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Federal Funds Effective Swap Rate | Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       0.50%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       1.00%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       0.00%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       0.75%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR Two | Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       1.00%            
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR Two | Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Applicable interest rate added to reference rate in order to compute variable interest rate       1.75%