Earnings per Share and Shareholders' Equity Share Repurchase (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended				6 Months Ended		159 Months Ended
	Dec. 18, 2023	Dec. 18, 2023	Feb. 28, 2025	Nov. 30, 2024	Feb. 29, 2024	Nov. 30, 2023	Feb. 28, 2025	Feb. 29, 2024	Nov. 30, 2024	Aug. 31, 2024	Aug. 31, 2023
Equity [Abstract]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			2,387,522				2,387,522
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 405,978	$ 398,009	$ 336,926	$ 321,676	$ 405,978	$ 336,926	$ 398,009	$ 391,979	$ 326,620
Net (loss) earnings			20,901	21,723	17,817	17,738	42,624	35,555
Other Comprehensive (Loss) Income, Net of Tax			(4,827)	(9,676)	(1,207)	370	(14,503)	$ (837)
Stock Issued During Period, Value, Employee Benefit Plan			97	91	35	51
Stock Issued During Period, Value, Restricted Stock Award, Gross			0	0	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			2,841	3,345	2,810	2,717
Stock Value Issued to Acquired For and Distributed From Rabbi Trust			91	$ 0	263	90
Retained earnings			290,008				$ 290,008			$ 261,870
Treasury Stock, Value, Acquired, Cost Method			$ 10,176		$ 3,992	$ 26,116			$ 853,400
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			10,000,000				10,000,000
Treasury Stock, Common, Shares			0				0			0
Stock Repurchased During Period, Shares		25,737	329,527					1,094,231
Treasury Stock, Shares, Acquired									30,411,708
Treasury Stock, Shares, Retired	139,324
Stock Repurchased During Period, Value			$ 14,600					$ 30,100
Common Stock [Member]
Stock Issued During Period, Shares, New Issues			54,259,000	54,400,000	54,253,000	83,967,000	54,259,000	54,253,000	54,400,000	54,235,000	83,761,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 10,852	$ 10,880	$ 10,851	$ 16,793	$ 10,852	$ 10,851	$ 10,880	$ 10,847	$ 16,752
Stock Issued During Period, Shares, Employee Benefit Plan			2,000	2,000	1,000	2,000
Stock Issued During Period, Value, Employee Benefit Plan						$ 0
Stock Issued During Period, Shares, Restricted Stock Award, Gross			73,000	186,000	105,000	118,000
Stock Issued During Period, Value, Restricted Stock Award, Gross			$ 14	$ 37	$ 21	$ 23
Stock Issued To Acquired For And Distributed From Rabbi Trust			2,000		26,000	3,000
Stock Value Issued to Acquired For and Distributed From Rabbi Trust			$ 1		$ 5	$ 1
Treasury Stock, Shares, Retired			(220,000)	(110,000)	(29,867,000)
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			$ 236,019	$ 233,964	$ 226,075	223,474	236,019	226,075	233,964	235,660	220,472
Stock Issued During Period, Value, Employee Benefit Plan			97	91	35	51
Stock Issued During Period, Value, Restricted Stock Award, Gross			(14)	37	21	23
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			2,841	3,345	2,810	2,717
Stock Value Issued to Acquired For and Distributed From Rabbi Trust			90		258	89
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			290,008	279,239	222,047	1,028,871	290,008	222,047	279,239	261,870	1,011,112
Net (loss) earnings			20,901	21,723	17,817	17,738
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(130,901)	(126,074)	(122,047)	(120,840)	(130,901)	(122,047)	(126,074)	(116,398)	(121,210)
Other Comprehensive (Loss) Income, Net of Tax			(4,827)	(9,676)	(1,207)	370
Stock held in trust [member] [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(3,575)	(3,774)	(3,777)	(3,576)	(3,575)	(3,777)	(3,774)	(3,777)	(3,484)
Stock Value Issued to Acquired For and Distributed From Rabbi Trust			(199)	3	(201)	(92)
Deferred Compensation, Share-based Payments [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			3,575	3,774	3,777	3,576	$ 3,575	$ 3,777	$ 3,774	$ 3,777	$ 3,484
Stock Value Issued to Acquired For and Distributed From Rabbi Trust			$ (199)	$ (3)	$ 201	$ 92