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Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
Revenue Recognition (Narrative) (Details) - USD ($)	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019	Aug. 31, 2019
Disaggregation of Revenue [Line Items]
Accrued liabilities	$ 20,627,000		$ 20,627,000		$ 18,513,000
Reduction to revenue	100,049,000	$ 101,335,000	198,605,000	$ 202,617,000
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	1,800,000		1,800,000
Contract assets	0		0		0
Accounting Standards Update 2014-09 [Member] \| Rebate [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	6,900,000		6,900,000		7,500,000
Reduction to revenue	(4,400,000)	(4,500,000)	(9,400,000)	(8,800,000)
Accounting Standards Update 2014-09 [Member] \| Cash Discounts [Member]
Disaggregation of Revenue [Line Items]
Reduction to revenue	$ (1,000,000.0)	$ (1,000,000.0)	$ (2,000,000.0)	$ (2,000,000.0)
Cash discount					$ 500,000