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Debt (Schedule Of Debt) (Details) - USD ($)
3 Months Ended
Nov. 30, 2019
Aug. 31, 2019
Debt Instrument [Line Items]    
Financing arrangements $ 1,074,000 $ 82,000
Less: unamortized debt issuance costs (1,064,000) (1,169,000)
Total debt, excluding obligations under finance leases 402,010,000 438,913,000
Less: current portion [1] (137,687,000) (174,688,000)
Total long-term debt, excluding obligations under finance leases $ 264,323,000 264,225,000
Committed Bank Facility [Member]    
Debt Instrument [Line Items]    
Maturity date Apr. 14, 2022  
Uncommitted Bank Facilities [Member]    
Debt Instrument [Line Items]    
Revolving credit facility $ 117,000,000 155,000,000
Shelf Facility Agreement [Member]    
Debt Instrument [Line Items]    
Shelf Facility 90,000,000 90,000,000
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  
[1] Net of unamortized debt issuance costs expected to be amortized in the next twelve months.