Nature Of Operations And Summary Of Significant Accounting Policies (Schedule Of Cumulative After-Tax Effects On Balance Sheet) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019	Sep. 01, 2018	Aug. 31, 2018
Assets:
Other current assets	$ 11,500	$ 11,027		$ 10,893
Deferred income tax assets	1,094	5,045		3,222
Liabilities and Shareholders' Equity:
Deferred subscription revenue	59,289	56,250		47,417
Other deferred revenue	7,389	5,972		4,471
Other liabilities	9,110	7,527		5,501
Retained earnings	$ 49,968	$ 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)