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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets)(Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011
Finite And Indefinite Intangible Assets [Line Items] |  |
Weighted average life | 11 years 3 months 18 days |
Amortizable intangible assets, gross | $ 39,573 | $ 40,429
Accumulated amortization | (14,503) | (11,790)
Trade Names [Member] |  |
Finite And Indefinite Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 6,575 | 6,719
Customer Relationships [Member] |  |
Finite And Indefinite Intangible Assets [Line Items] |  |
Weighted average life | 8 years 4 months 24 days | 9 years 8 months 12 days
Amortizable intangible assets, gross | 6,313 | 6,371
Accumulated amortization | (3,477) | (2,768)
Noncompete Agreements [Member] |  |
Finite And Indefinite Intangible Assets [Line Items] |  |
Weighted average life | 5 years 6 months | 6 years 10 months 24 days
Amortizable intangible assets, gross | 846 | 852
Accumulated amortization | (478) | (320)
Other Intangible Assets [Member] |  |
Finite And Indefinite Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 202 | 171
Accumulated amortization | (90) | (41)
Patents [Member] |  |
Finite And Indefinite Intangible Assets [Line Items] |  |
Weighted average life | 12 years 8 months 12 days | 13 years 1 month 6 days
Amortizable intangible assets, gross | 25,637 | 26,316
Accumulated amortization | $ (10,458) | $ (8,661)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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