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Basis Of Presentation (Schedule Of Cumulative After-Tax Effects On Balance Sheet) (Details) - USD ($)
$ in Thousands
May 31, 2019
Sep. 01, 2018
Aug. 31, 2018
Assets:      
Deferred income tax assets $ 6,455   $ 3,222
Liabilities and Shareholders' Equity:      
Deferred revenue 45,168   51,888
Other liabilities 8,193   5,501
Retained earnings 53,528   63,569
Accounting Standards Update 2014-09 [Member]      
Assets:      
Other current assets   $ 11,002 10,893
Deferred income tax assets 6,455 4,227 3,222
Liabilities and Shareholders' Equity:      
Deferred revenue 45,168 53,896 51,888
Other liabilities 8,193 7,750 5,501
Retained earnings $ 53,528 60,426 $ 63,569
ASC 606 Adjustments [Member] | Accounting Standards Update 2014-09 [Member]      
Assets:      
Other current assets   109  
Deferred income tax assets   1,005  
Liabilities and Shareholders' Equity:      
Deferred revenue   2,008  
Other liabilities   2,249  
Retained earnings   $ (3,143)