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Income Taxes (Summary Of Tax Credit Carryforwards) (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2016
USD ($)
Tax Credit Carryforward [Line Items]  
Credits Generated $ 16,181
Credits Used in Prior Years (9,477)
Credits Used in Fiscal 2016 (3,920)
Credits Carried Forward $ 2,784
2010 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2010
Credit Expires Aug. 31, 2020
Credits Generated $ 2,907
Credits Used in Prior Years (1,299)
Credits Used in Fiscal 2016 (1,608)
Credits Carried Forward
2011 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2011
Credit Expires Aug. 31, 2021
Credits Generated $ 3,448
Credits Used in Fiscal 2016 (664)
Credits Carried Forward $ 2,784
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 Used in Fiscal 2016
Credits Carried Forward
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 Used in Fiscal 2016
Credits Carried Forward
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 Used in Fiscal 2016
Credits Carried Forward
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 Used in Fiscal 2016
Credits Carried Forward
2016 [Member]  
Tax Credit Carryforward [Line Items]  
Credit Generated in Fiscal Year Ended Aug. 31, 2016
Credit Expires Aug. 31, 2026
Credits Generated $ 1,648
Credits Used in Fiscal 2016 (1,648)
Credits Carried Forward