Condensed Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Beginning balance, shares at Aug. 31, 2018	27,056
Beginning balance at Aug. 31, 2018	$ 1,353	$ 211,280	$ 63,569	$ 341
Beginning balance, shares, Treasury at Aug. 31, 2018					(13,159)
Beginning balance, Treasury at Aug. 31, 2018					$ (196,043)
Issuance of common stock from treasury, shares					11
Issuance of common stock from treasury		64			$ 166
Purchase of treasury shares					$ (7)
Stock-based compensation		946
Cumulative translation adjustments				(309)
Net income (loss)			(1,357)
Ending balance, shares at Nov. 30, 2018	27,056
Ending balance at Nov. 30, 2018	$ 1,353	212,290	59,069	32
Ending balance, shares, Treasury at Nov. 30, 2018					(13,148)
Ending balance, Treasury at Nov. 30, 2018					$ (195,884)
Beginning balance, shares at Aug. 31, 2018	27,056
Beginning balance at Aug. 31, 2018	$ 1,353	211,280	63,569	341
Beginning balance, shares, Treasury at Aug. 31, 2018					(13,159)
Beginning balance, Treasury at Aug. 31, 2018					$ (196,043)
Cumulative translation adjustments						$ 129
Net income (loss)						(4,874)
Ending balance, shares at Feb. 28, 2019	27,056
Ending balance at Feb. 28, 2019	$ 1,353	212,960	55,552	470
Ending balance, shares, Treasury at Feb. 28, 2019					(13,109)
Ending balance, Treasury at Feb. 28, 2019					$ (195,301)
Cumulative effect of accounting change			(3,143)
Beginning balance, shares at Nov. 30, 2018	27,056
Beginning balance at Nov. 30, 2018	$ 1,353	212,290	59,069	32
Beginning balance, shares, Treasury at Nov. 30, 2018					(13,148)
Beginning balance, Treasury at Nov. 30, 2018					$ (195,884)
Issuance of common stock from treasury, shares					11
Issuance of common stock from treasury		53			$ 162
Purchase of treasury shares					$ (5)
Stock-based compensation		1,043
Restricted stock award, shares					28
Restricted stock award		(426)			$ 426
Cumulative translation adjustments				438		438
Net income (loss)			(3,517)			(3,517)
Ending balance, shares at Feb. 28, 2019	27,056
Ending balance at Feb. 28, 2019	$ 1,353	212,960	55,552	470
Ending balance, shares, Treasury at Feb. 28, 2019					(13,109)
Ending balance, Treasury at Feb. 28, 2019					$ (195,301)
Beginning balance, shares at Aug. 31, 2019	27,056
Beginning balance at Aug. 31, 2019	$ 1,353	215,964	59,403	269		82,014
Beginning balance, shares, Treasury at Aug. 31, 2019					(13,087)
Beginning balance, Treasury at Aug. 31, 2019					$ (194,975)
Issuance of common stock from treasury, shares					9
Issuance of common stock from treasury		131			$ 123
Purchase of treasury shares					$ (3)
Stock-based compensation		1,851
Cumulative translation adjustments				(37)
Net income (loss)			(544)
Ending balance, shares at Nov. 30, 2019	27,056
Ending balance at Nov. 30, 2019	$ 1,353	217,946	58,859	232
Ending balance, shares, Treasury at Nov. 30, 2019					(13,078)
Ending balance, Treasury at Nov. 30, 2019					$ (194,855)
Beginning balance, shares at Aug. 31, 2019	27,056
Beginning balance at Aug. 31, 2019	$ 1,353	215,964	59,403	269		82,014
Beginning balance, shares, Treasury at Aug. 31, 2019					(13,087)
Beginning balance, Treasury at Aug. 31, 2019					$ (194,975)
Cumulative translation adjustments						53
Net income (loss)						553
Ending balance, shares at Feb. 29, 2020	27,056
Ending balance at Feb. 29, 2020	$ 1,353	216,045	59,956	322		72,915
Ending balance, shares, Treasury at Feb. 29, 2020					(13,209)
Ending balance, Treasury at Feb. 29, 2020					$ (204,761)
Beginning balance, shares at Nov. 30, 2019	27,056
Beginning balance at Nov. 30, 2019	$ 1,353	217,946	58,859	232
Beginning balance, shares, Treasury at Nov. 30, 2019					(13,078)
Beginning balance, Treasury at Nov. 30, 2019					$ (194,855)
Issuance of common stock from treasury, shares					241
Issuance of common stock from treasury		(3,361)			$ 3,591
Purchase of treasury shares, shares					(393)
Purchase of treasury shares					$ (13,830)
Stock-based compensation		1,793
Restricted stock award, shares					21
Restricted stock award		(333)			$ 333
Cumulative translation adjustments				90		90
Net income (loss)			1,097			1,097
Ending balance, shares at Feb. 29, 2020	27,056
Ending balance at Feb. 29, 2020	$ 1,353	$ 216,045	$ 59,956	$ 322		$ 72,915
Ending balance, shares, Treasury at Feb. 29, 2020					(13,209)
Ending balance, Treasury at Feb. 29, 2020					$ (204,761)