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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Nov. 30, 2014 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  | $ 95,597,000 | $ 95,649,000 | $ 96,409,000
Impairment of goodwill | $ 0 |  | 0 | 0 | 0
Impairment charges |  |  | 0 | 0 | 0
Estimated fair value |  |  | 16,244,000 | $ 19,191,000 | $ 22,961,000
GT 85 Limited [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Purchase consideration |  | $ 4,100,000 |  |  |
Cash paid |  | 3,700,000 |  |  |
Goodwill |  | 1,300,000 |  |  |
Customer-Related [Member] | GT 85 Limited [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Purchase consideration |  | $ 1,700,000 |  |  |
Estimated useful life |  | 8 years |  |  |
Trade Names [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated fair value |  |  | 15,011,000 |  |
Trade Names [Member] | GT 85 Limited [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Purchase consideration |  | $ 900,000 |  |  |
Estimated useful life |  | 10 years |  |  |
Technology [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated fair value |  |  | 33,000 |  |
Technology [Member] | GT 85 Limited [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Purchase consideration |  | $ 200,000 |  |  |
Estimated useful life |  | 4 years |  |  |
Customer-Based [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated fair value |  |  | $ 1,200,000 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + 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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- Definition Amount after 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=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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