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Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Oct. 18, 2019 item shares	Jan. 25, 2019 USD ($) $ / shares shares	Oct. 01, 2018 item shares	Nov. 14, 2017 item shares	Aug. 31, 2020 USD ($) item employee shares	Aug. 31, 2019 USD ($) employee shares	Aug. 31, 2018 USD ($) employee shares	Oct. 18, 2016 item shares	Nov. 12, 2015 item shares	Aug. 31, 2015 item shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued from treasury stock					311,452
Capitalized stock-based compensation expense \| $					$ 0
Income tax benefit from exercise of stock option \| $					$ 1,800
Number of shares withheld for statutory income taxes					109,896
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld for tax					102,656
Shares withheld for tax, value \| $					$ 3,600
Unrecognized compensation expense \| $					$ 0
Stock options exercised					350,000
Aggregate intrinsic value \| $					$ 8,000
Income tax benefit from exercise of stock option \| $					$ 1,800
Fiscal 2020 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares granted	25,101
Shares authorized to be issued	150,630
Number of tranches \| item	3
Life of awards	3 years
Expiration date	Aug. 31, 2022
Percent of shares plan participants are entitled to	25.00%
Vesting period of awards	3 years
Fiscal 2019 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares granted			36,470
Shares authorized to be issued			218,818
Shares vested					0	0
Number of tranches \| item			3
Life of awards			3 years
Expiration date			Aug. 31, 2021
Percent of shares plan participants are entitled to			25.00%
Vesting period of awards			3 years
Fiscal 2018 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued				257,300
Shares earned by participants					221,067
Number of tranches \| item				3
Life of awards				3 years
Fiscal 2017 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued								183,381
Number of individual vesting conditions \| item								6
Number of performance measures \| item								2
Shares vested					97,803
Number of tranches \| item					4
Life of awards					6 years
Expiration date					Aug. 31, 2022
Fiscal 2016 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued									231,276
Number of individual vesting conditions \| item									6
Number of performance measures \| item									2
Shares vested					123,348
Number of tranches \| item					4
Life of awards					6 years
Expiration date					Aug. 31, 2021
Fiscal 2015 Executive Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be issued										112,464
Number of individual vesting conditions \| item										6
Number of performance measures \| item										2
Shares vested					59,980
Number of tranches \| item					4
Life of awards					6 years
Expiration date					Aug. 31, 2020
Shares expired unvested					52,484
Fiscal 2019 Time Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price per share \| $ / shares		$ 24.54
Vesting period of awards		2 years
Shares issued under terms of the award		11,915
Fair value of shares awarded \| $		$ 300
Omnibus Incentive Plan 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized additional shares of common stock for issuance		700,000
Shares available for future grants					511,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $					$ 200
Whole-share grant per eligible director \| $					$ 100
Vesting period of awards					1 year
Cost of common stock issued from treasury \| $					$ 300	$ 400	$ 300
Weighted-average vesting period for recognition					4 months
Total recognized tax benefit from unvested stock awards \| $					$ 200	$ 200	$ 200
Intrinsic value of unvested stock awards \| $					$ 400
Restricted Stock Awards [Member] \| Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under terms of the award					21,420	28,525	23,338
Fair value of shares awarded \| $					$ 700	$ 700	$ 700
2017 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase in employee stock purchase plan					862,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price of common stock as a percent of the average fair market value					85.00%
Shares purchased by employee stock purchase plan participants					41,409	43,073	40,941
Cost basis of shares issued to employee stock purchase plan participants \| $					$ 600	$ 600	$ 600
Proceeds from ESPP participants \| $					$ 1,000	$ 1,000	$ 800
Fully Vested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of individuals who qualified for award \| employee					4	4	1
Tranche One [Member] \| Fiscal 2018 Long Term Incentive Plan Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares granted				42,883
Percent of shares plan participants are entitled to				25.00%
Vesting period of awards				3 years
Tranche Two And Three [Member] \| Fiscal 2020 Long Term Incentive Plan Award [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted	50.00%
Tranche Two And Three [Member] \| Fiscal 2020 Long Term Incentive Plan Award [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted	200.00%
Tranche Two And Three [Member] \| Fiscal 2019 Long Term Incentive Plan Award [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted			50.00%
Tranche Two And Three [Member] \| Fiscal 2019 Long Term Incentive Plan Award [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted			200.00%
Tranche Two And Three [Member] \| Fiscal 2018 Long Term Incentive Plan Award [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted				50.00%
Tranche Two And Three [Member] \| Fiscal 2018 Long Term Incentive Plan Award [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of performance award to be granted				200.00%