Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($) $ in Thousands		6 Months Ended
		Feb. 28, 2022	Aug. 31, 2021
Debt Instrument [Line Items]
Total Borrowings		$ 114,847	$ 115,740
Short-term portion of borrowings		(2,038)	(800)
Long-term borrowings		$ 112,809	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
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]	$ 46,047	$ 46,540
Long-term borrowings		44,800
Short term portion of long-term debt		$ 1,200
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 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 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, 2022, $44.8 million on this facility is classified as long-term and is denominated in Euros and Pound Sterling, whereas $1.2 million is classified as short-term and is denominated 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.