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Condensed Consolidated Statements Of Shareholders' Equity - 3 months ended Nov. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Capital In Excess Of Stated Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]
Beginning balance, value at Aug. 31, 2018	$ 276,866	$ 18,841	$ (277,238)	$ 68,465	$ 484,886	$ (18,088)
Beginning balance, shares at Aug. 31, 2018		18,841	8,083
Net earnings	1,212				1,212
Other comprehensive income	1,135					1,135
Total comprehensive income	2,347
Cash dividends per share	(3,344)				(3,344)
Issuance of common shares under share compensation plans, net, value	(943)	$ 29		(972)
Issuance of common shares under share compensation plans, net, shares		29
Share-based compensation expense	1,217			1,217
Cumulative impact of ASC/ASU adoption | ASC 606 [Member]	532				532
Cumulative impact of ASC/ASU adoption | ASU 2018-02 [Member]					525	(525)
Ending balance, value at Nov. 30, 2018	$ 276,675	$ 18,870	$ (277,238)	$ 68,710	$ 483,811	$ (17,478)
Ending Balance, shares at Nov. 30, 2018		18,870	8,083

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