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Goodwill And Other Intangible Assets (Carrying Amount In Goodwill By Segments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 76,801 | $ 37,021
Foreign currency translation | 2 | (1,099)
Goodwill, Ending Balance | 76,803 | 76,801
Elecsys [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 39,986
SPF Water Engineering [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 893
Irrigation [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 60,905 | 20,293
Foreign currency translation | 37 | (267)
Goodwill, Ending Balance | 60,942 | 60,905
Irrigation [Member] | Elecsys [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 39,986
Irrigation [Member] | SPF Water Engineering [Member] |  |
Goodwill [Line Items] |  |
Acquisition |  | 893
Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 15,896 | 16,728
Foreign currency translation | (35) | (832)
Goodwill, Ending Balance | $ 15,861 | $ 15,896

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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 -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 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments 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 (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |