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Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended
Revenue Recognition (Narrative) (Details) - USD ($)	May 31, 2019	Nov. 30, 2018	May 31, 2018	May 31, 2019	May 31, 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	$ 17,221,000			$ 17,221,000			$ 26,240,000
Revenue	113,989,000		$ 107,025,000	316,606,000	$ 305,878,000
Net trade receivables	75,992,000			75,992,000			69,025,000
Other current assets	6,097,000			6,097,000			13,337,000
Contract assets	0			0			$ 0
Retained Earnings [Member]
Disaggregation of Revenue [Line Items]
Cumulative effect of change in accounting principle	98,000	(324,000)		98,000				$ (128,000)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	800,000			800,000		$ 1,100,000
Contract liabilities recognized to revenue		1,100,000
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Disaggregation of Revenue [Line Items]
Cumulative effect of change in accounting principle		$ 300,000
Accounting Standards Update 2014-09 [Member] \| Rebate [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	7,000,000.0			7,000,000.0
Revenue	4,600,000			13,400,000
Accounting Standards Update 2014-09 [Member] \| Coupons [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	300,000			300,000
Revenue	200,000			400,000
Accounting Standards Update 2014-09 [Member] \| Cash Discounts [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,200,000			3,200,000
Net trade receivables	500,000			500,000
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