Basis Of Presentation (Balance Sheet Impacted By Adoption Of New Accounting Standard) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Sep. 01, 2018	Aug. 31, 2018
Assets:
Prepaid expenses and other current assets	$ 13,841		$ 14,757
Deferred income tax assets	4,877		3,222
Total assets	196,324		213,875
Liabilities and Shareholders' Equity:
Deferred revenue	46,221		51,888
Other liabilities	7,747		5,501
Retained earnings	59,069		63,569
Total liabilities and shareholders' equity	196,324		213,875
Accounting Standards Update 2014-09 [Member]
Assets:
Prepaid expenses and other current assets	13,841
Deferred income tax assets	4,877	$ 4,227	3,222
Total assets	196,324
Liabilities and Shareholders' Equity:
Deferred revenue	46,221	53,896	51,888
Other liabilities	7,747	7,750	5,501
Retained earnings	59,069	$ 60,426	$ 63,569
Total liabilities and shareholders' equity	196,324
Without ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets:
Prepaid expenses and other current assets	13,770
Deferred income tax assets	4,641
Total assets	196,017
Liabilities and Shareholders' Equity:
Deferred revenue	47,153
Other liabilities	5,743
Retained earnings	59,834
Total liabilities and shareholders' equity	196,017
Impact Of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets:
Prepaid expenses and other current assets	71
Deferred income tax assets	236
Total assets	307
Liabilities and Shareholders' Equity:
Deferred revenue	(932)
Other liabilities	2,004
Retained earnings	(765)
Total liabilities and shareholders' equity	$ 307