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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 22, 2015 | Aug. 31, 2015 | Jul. 20, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs |  | $ 1,800 |  |  |
Weighted Average Useful Life in Years |  | 11 years 6 months |  |  |
Goodwill |  | $ 76,801 |  | $ 37,021 | $ 37,414
Tradenames [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible assets acquired |  | $ 7,430 |  |  |
Elecsys [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ 17.50 |  |  |  |
Finite-lived intangible assets acquired | $ 17,100 |  |  |  |
Total cash consideration | 70,577 |  |  |  |
Total cash consideration, net of cash acquired | 67,176 |  |  |  |
Business acquisition allocation, cash | 3,401 |  |  |  |
Goodwill | $ 39,986 |  |  |  |
SPF Water Engineering [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total cash consideration |  |  | $ 2,500 |  |
Total cash consideration, net of cash acquired |  |  | 2,400 |  |
Business acquisition allocation, cash |  |  | 100 |  |
Current assets |  |  | 700 |  |
Fixed assets |  |  | 100 |  |
Finite-lived intangible assets |  |  | 1,000 |  |
Goodwill |  |  | 900 |  |
Current liabilities |  |  | $ 200 |  |

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