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Income Taxes (Summary Of Tax Credit Carryforwards) (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2017
USD ($)
Tax Credit Carryforward [Line Items]  
Credits Generated $ 14,988
Credits Used in Prior Years (10,606)
Credits Used in Fiscal 2017
Credits Carried Forward $ 4,382
2011 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2010
Credit Expires Aug. 31, 2020
Credits Generated $ 3,445
Credits Used in Prior Years (859)
Credits Used in Fiscal 2017
Credits Carried Forward $ 2,586
2012 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2011
Credit Expires Aug. 31, 2021
Credits Generated $ 2,563
Credits Used in Prior Years (2,563)
Credits Used in Fiscal 2017
Credits Carried Forward
2013 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2012
Credit Expires Aug. 31, 2022
Credits Generated $ 2,815
Credits Used in Prior Years (2,815)
Credits Used in Fiscal 2017
Credits Carried Forward
2014 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2013
Credit Expires Aug. 31, 2023
Credits Generated $ 1,378
Credits Used in Prior Years (1,378)
Credits Used in Fiscal 2017
Credits Carried Forward
2015 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2014
Credit Expires Aug. 31, 2024
Credits Generated $ 1,422
Credits Used in Prior Years (1,422)
Credits Used in Fiscal 2017
Credits Carried Forward
2016 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2015
Credit Expires Aug. 31, 2025
Credits Generated $ 1,569
Credits Used in Prior Years (1,569)
Credits Used in Fiscal 2017
Credits Carried Forward
2017 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2016
Credit Expires Aug. 31, 2026
Credits Generated $ 1,796
Credits Used in Fiscal 2017
Credits Carried Forward $ 1,796