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Debt (Schedule Of Debt) (Details) - USD ($)
9 Months Ended
May 30, 2020
Aug. 31, 2019
Debt Instrument [Line Items]    
Financing arrangements $ 437,000 $ 82,000
Less: unamortized debt issuance costs (954,000) (1,169,000)
Total debt, excluding obligations under finance leases 973,683,000 438,913,000
Less: current portion [1] (309,229,000) (174,688,000)
Total long-term debt, excluding obligations under finance leases 664,454,000 264,225,000
Committed Bank Facility [Member]    
Debt Instrument [Line Items]    
Credit facility $ 588,000,000  
Maturity date Apr. 14, 2022  
Uncommitted Bank Facilities [Member]    
Debt Instrument [Line Items]    
Credit facility $ 1,200,000 155,000,000
Senior Notes Series A [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount $ 75,000,000 75,000,000
Interest rate 2.65%  
Maturity date Jul. 28, 2023  
Senior Notes Series B [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount $ 100,000,000 100,000,000
Interest rate 2.90%  
Maturity date Jul. 28, 2026  
Senior Notes Due June 11, 2025 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount $ 20,000,000 20,000,000
Interest rate 3.79%  
Maturity date Jun. 11, 2025  
Senior notes, due March 5, 2027 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount $ 50,000,000  
Interest rate 2.60%  
Maturity date Mar. 05, 2027  
Senior notes due January 12, 2023 [MEmber] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount [2] $ 50,000,000 50,000,000
Interest rate 3.04%  
Maturity date Jan. 12, 2023  
Series 2018A notes, due June 11, 2020 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount [2] $ 20,000,000 20,000,000
Interest rate 3.22%  
Maturity date Jun. 11, 2020  
Series 2018B notes, due June 11, 2021 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount [2] $ 20,000,000 $ 20,000,000
Interest rate 3.42%  
Maturity date Jun. 11, 2021  
Series 2019A notes, due March 5, 2024 [Member] | Private Placement Debt [Member]    
Debt Instrument [Line Items]    
Principal amount [2] $ 50,000,000  
Interest rate 2.40%  
Maturity date Mar. 05, 2024  
[1] Net of unamortized debt issuance costs expected to be amortized in the next twelve months.(2)Represents private placement debt issued under
[2] Represents private placement debt issued under Shelf Facility Agreements, discussed in further detail below.