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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2022
Aug. 31, 2022
Debt Instrument [Line Items]    
Total Borrowings $ 150,439 $ 146,312
Short-term portion of borrowings (42,537) (39,173)
Long-term borrowings $ 107,902 107,139
Series A Notes [Member]    
Debt Instrument [Line Items]    
Issuance [1] Nov. 15, 2017  
Maturity date Nov. 15, 2032  
Interest rate 3.39%  
Total Borrowings [1] $ 16,000 16,400
Short term portion of long-term debt $ 800  
Principal payment frequency of periodic payment semi-annually  
Periodic payment amount $ 400  
Periodic principal maturity May 15, 2032  
Remaining principal payment $ 8,400  
Series B Notes [Member]    
Debt Instrument [Line Items]    
Issuance [2] Sep. 30, 2020  
Maturity date [2] Nov. 15, 2027  
Interest rate 2.50%  
Total Borrowings [2] $ 26,000 26,000
Series C Notes [Member]    
Debt Instrument [Line Items]    
Issuance [2] Sep. 30, 2020  
Maturity date [2] Nov. 15, 2030  
Interest rate 2.69%  
Total Borrowings [2] $ 26,000 26,000
Series B and Series C Notes [Member]    
Debt Instrument [Line Items]    
Principal payment frequency of periodic payment semi-annually  
Credit Agreement - Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Maturity date [3] Sep. 30, 2025  
Total Borrowings [3] $ 82,439 $ 77,912
Long-term borrowings 40,700  
Short term portion of long-term debt $ 41,700  
Minimum [Member] | Series A Notes [Member]    
Debt Instrument [Line Items]    
Maturity year [1] 2021  
Maximum [Member] | Series A Notes [Member]    
Debt Instrument [Line Items]    
Maturity year [1] 2032  
[1] Principal payments are required semi-annually in May and November of each year in equal installments of $0.4 million through May 15, 2032, resulting in $0.8 million classified as short-term. The remaining outstanding principal in the amount of $8.4 million will become due on November 15, 2032.
[2] Interest on notes is payable semi-annually in May and November of each year with no principal due until the maturity date.
[3] The Company can refinance any draw under the line of credit with successive short-term borrowings through the maturity date. Outstanding draws for which management has the ability and intent to refinance with successive short-term borrowings for a period of at least twelve months are classified as long-term. As of November 30, 2022, $40.7 million on this facility is classified as long-term and is denominated in Euros and Pound Sterling, whereas $41.7 million is classified as short-term and is denominated entirely in U.S. Dollar. Euro and Pound Sterling denominated draws will fluctuate in U.S. Dollars from period to period due to changes in foreign currency exchange rates.