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Debt And Capital Lease Obligations (Private Placement Debt) (Narrative) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2019	Sep. 01, 2018
Senior Notes Due June 11, 2025 [Member]
Debt Instrument [Line Items]
Principal amount	$ 20,000,000
Interest rate	3.79%
Maturity date	Jun. 11, 2025
Private Placement Debt [Member] | Senior Notes Series A [Member]
Debt Instrument [Line Items]
Principal amount	$ 75,000,000	$ 75,000,000
Interest rate	2.65%
Maturity date	Jul. 28, 2023
Private Placement Debt [Member] | Senior Notes Series B [Member]
Debt Instrument [Line Items]
Principal amount	$ 100,000,000	100,000,000
Interest rate	2.90%
Maturity date	Jul. 28, 2026
Private Placement Debt [Member] | Senior Notes Due June 11, 2025 [Member]
Debt Instrument [Line Items]
Principal amount	$ 20,000,000	$ 20,000,000

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Topic 835
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-Section 55
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 820
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