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Income Taxes (Summary Of Tax Credit Carryforwards) (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2022
USD ($)
Tax Credit Carryforward [Line Items]  
Credits Generated $ 5,444
Credits Used in Prior Years (1,348)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward $ 4,096
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 (967)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward $ 760
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 (234)
Credits Reduced in Current Year
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 (147)
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward $ 863
Tax Year 2022 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2022
Credit Expires Aug. 31, 2032
Credits Generated $ 1,129
Credits Used in Prior Years
Credits Reduced in Current Year
Credits Used in Current Year
Credits Carried Forward $ 1,129