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Nature Of Operations And Summary Of Significant Accounting Policies (Schedule Of Cumulative After-Tax Effects On Balance Sheet) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Sep. 01, 2018
Aug. 31, 2018
Assets:      
Other current assets $ 11,027   $ 10,893
Deferred income tax assets 5,045   3,222
Liabilities and Shareholders' Equity:      
Deferred subscription revenue 56,250   47,417
Other deferred revenue 5,972   4,471
Other liabilities 7,527   5,501
Retained earnings $ 59,403   $ 63,569
ASU 2014-09 [Member]      
Assets:      
Other current assets   $ 11,002  
Deferred income tax assets   4,227  
Liabilities and Shareholders' Equity:      
Deferred subscription revenue   48,870  
Other deferred revenue   5,026  
Other liabilities   7,750  
Retained earnings   60,426  
ASC 606 Adjustments [Member] | ASU 2014-09 [Member]      
Assets:      
Other current assets   109  
Deferred income tax assets   1,005  
Liabilities and Shareholders' Equity:      
Deferred subscription revenue   1,453  
Other deferred revenue   555  
Other liabilities   2,249  
Retained earnings   $ (3,143)