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Income Taxes (Summary Of Tax Credit Carryforwards) (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2021 USD ($)
Tax Credit Carryforward [Line Items]
Credits Generated	$ 20,414
Credits Used in Prior Years	(10,161)
Credits Reduced in Current Year	(787)
Credits Used in Current Year
Credits Carried Forward	$ 9,466
Tax Year 2011 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2011
Credit Expires	Aug. 31, 2021
Credits Generated	$ 3,445
Credits Used in Prior Years	(414)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward	$ 3,031
Tax Year 2012 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2012
Credit Expires	Aug. 31, 2022
Credits Generated	$ 2,563
Credits Used in Prior Years	(2,563)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward
Tax Year 2013 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2013
Credit Expires	Aug. 31, 2023
Credits Generated	$ 2,815
Credits Used in Prior Years	(2,815)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward
Tax Year 2014 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2014
Credit Expires	Aug. 31, 2024
Credits Generated	$ 1,378
Credits Used in Prior Years	(1,378)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward
Tax Year 2015 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2015
Credit Expires	Aug. 31, 2025
Credits Generated	$ 1,422
Credits Used in Prior Years	(1,422)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward
Tax Year 2016 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2016
Credit Expires	Aug. 31, 2026
Credits Generated	$ 1,569
Credits Used in Prior Years	(1,569)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward
Tax Year 2017 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2017
Credit Expires	Aug. 31, 2027
Credits Generated	$ 1,804
Credits Used in Prior Years
Credits Reduced in Current Year	(299)
Credits Used in Current Year
Credits Carried Forward	$ 1,505
Tax Year 2018 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2018
Credit Expires	Aug. 31, 2028
Credits Generated	$ 1,727
Credits Used in Prior Years
Credits Reduced in Current Year	(107)
Credits Used in Current Year
Credits Carried Forward	$ 1,620
Tax Year 2019 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2019
Credit Expires	Aug. 31, 2029
Credits Generated	$ 1,578
Credits Used in Prior Years
Credits Reduced in Current Year	(234)
Credits Used in Current Year
Credits Carried Forward	$ 1,344
Tax Year 2020 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2020
Credit Expires	Aug. 31, 2030
Credits Generated	$ 1,010
Credits Used in Prior Years
Credits Reduced in Current Year	(147)
Credits Used in Current Year
Credits Carried Forward	$ 863
Tax Year 2021 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2021
Credit Expires	Aug. 31, 2031
Credits Generated	$ 1,103
Credits Used in Prior Years
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward	$ 1,103

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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