Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($) $ in Thousands		3 Months Ended
		Nov. 30, 2021	Aug. 31, 2021
Debt Instrument [Line Items]
Total Borrowings		$ 113,529	$ 115,740
Short-term portion of borrowings		(800)	(800)
Long-term borrowings		$ 112,729	114,940
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]	$ 16,800	17,200
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]	$ 44,729	$ 46,540
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. 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 has the ability to refinance any draw under the line of credit with successive short-term borrowings through the maturity date. Outstanding draws for which management has both 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, 2021, the entire balance on this facility is classified as long-term and only contains amounts denominated in Euros and Pound Sterling. Euro and Pound Sterling denominated draws will fluctuate in U.S. Dollars from period to period due to changes in foreign currency exchange rates.