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Property, Plant And Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | $ 159,522 | $ 158,142 |
Accumulated depreciation | (90,210) | (88,750) |
Total operating property, plant and equipment, net | 69,312 | 69,392 |
Machines | 6,868 | 5,769 |
Barriers | 16,306 | 17,687 |
Total property held for lease | 23,174 | 23,456 |
Accumulated depreciation | (14,859) | (14,192) |
Total property held for lease, net | 8,315 | 9,264 |
Property, plant and equipment, net | 77,627 | 78,656 |
Depreciation expense | 12,200 | 11,700 | $ 10,800
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | 4,817 | 4,721 |
Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | 48,417 | 44,032 |
Machinery And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | 73,185 | 70,605 |
Furniture and Fixtures [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | 24,787 | 29,649 |
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total operating property, plant and equipment | $ 8,316 | $ 9,135 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets excluding assets held under lease agreements used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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