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Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	Aug. 31, 2020
Disaggregation of Revenue [Line Items]
Accrued liabilities	$ 24,451,000		$ 24,451,000		$ 21,660,000
Reduction to revenue	111,905,000	$ 100,049,000	236,464,000	$ 198,605,000
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities	2,300,000		2,300,000		1,400,000
Contract assets	0		0		0
Accounting Standards Update 2014-09 [Member] | Rebate [Member]
Disaggregation of Revenue [Line Items]
Accrued liabilities	7,800,000		7,800,000		7,500,000
Reduction to revenue	(5,800,000)	(4,400,000)	(11,100,000)	(9,400,000)
Accounting Standards Update 2014-09 [Member] | Cash Discounts [Member]
Disaggregation of Revenue [Line Items]
Reduction to revenue	(1,100,000)	$ (1,000,000.0)	(2,300,000)	$ (2,000,000.0)
Allowance for cash discount	$ 500,000		$ 500,000		$ 500,000

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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