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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Feb. 28, 2023
Aug. 31, 2022
Debt Instrument [Line Items]    
Total Borrowings $ 155,786 $ 146,312
Short-term portion of borrowings (47,477) (39,173)
Long-term borrowings $ 108,309 107,139
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] $ 87,786 $ 77,912
Long-term borrowings 41,100  
Short term portion of long-term debt $ 46,700  
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 February 28, 2023, $41.1 million on this facility is classified as long-term and is denominated in Euros and Pounds Sterling, whereas $46.7 million is classified as short-term and is denominated entirely in U.S. Dollars. Euro and Pound Sterling denominated draws fluctuate in U.S. Dollars from period to period due to changes in foreign currency exchange rates.