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Fair Value Measurements (Narrative) (Details) - USD ($)	6 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Marketable securities	$ 18,700,000
Percentage of marketable securities investments mature within one year	55.00%
Percentage of marketable securities investments mature within one to three years	45.00%
Fair Value, Measurements, Nonrecurring [Member]
Assets fair value adjustments	$ 0	$ 0
Liabilities fair value adjustments	$ 0	$ 0

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Percentage of marketable securities investments mature within one to three years.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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