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Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended
Revenue Recognition (Narrative) (Details) - USD ($)	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	Sep. 01, 2018	Aug. 31, 2018	Nov. 30, 2017
Disaggregation of Revenue [Line Items]
Cumulative effect of change in accounting principle		$ (324,000)						$ 61,000
Accrued liabilities	19,424,000			19,424,000			$ 26,240,000
Revenue	101,335,000		101,256,000	202,617,000	198,853,000
Net trade receivables	75,239,000			75,239,000			69,025,000
Other current assets	8,079,000			8,079,000			$ 13,337,000
Contract assets	0			0		$ 0
Retained Earnings [Member]
Disaggregation of Revenue [Line Items]
Cumulative effect of change in accounting principle		(324,000)						$ (128,000)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	1,200,000			1,200,000		$ 1,100,000
Contract liabilities recognized to revenue		$ 1,100,000
Accounting Standards Update 2014-09 [Member] \| Rebate [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	8,400,000			8,400,000
Revenue	4,500,000			8,800,000
Accounting Standards Update 2014-09 [Member] \| Coupons [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	200,000			200,000
Revenue	100,000			200,000
Accounting Standards Update 2014-09 [Member] \| Cash Discounts [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,000,000			2,000,000
Net trade receivables	400,000			400,000
Accounting Standards Update 2014-09 [Member] \| Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	400,000			400,000
Other current assets	$ 100,000			$ 100,000