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Credit Arrangements (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands | Aug. 31, 2016 | Aug. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 117,173 | $ 117,366
Less current portion | (197) | (193)
Total long-term debt | 116,976 | 117,173
Series 2006A Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 2,200 |
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 115,000 | 115,000
Senior Notes [Member] | Series 2006A Bonds [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,173 | $ 2,366

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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