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Acquisitions (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |
Goodwill acquired |  |  | $ 223,732 | $ 166,406 | $ 165,568
Northern Technical [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of voting interest acquired | 100.00% |  |  |  |
Total consideration of transaction | $ 97,100 |  |  |  |
Amount of intangible assets acquired | 6,200 |  |  |  |
Net tangible assets | 32,200 |  |  |  |
Goodwill acquired | $ 60,300 |  |  |  |
Period from purchase date the purchase price allocation is expected to be finalized |  |  | 1 year |  |
Northern Technical [Member] | Minimum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life, years |  |  | 6 months |  |
Northern Technical [Member] | Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful life, years |  |  | 7 years |  |
Engineered Products Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  |  | $ 9,000 |  |
Ifil [Member] | Minimum [Member] | Scenario Forecast [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  | $ 6,000 |  |  |
Ifil [Member] | Maximum [Member] | Scenario Forecast [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  | $ 8,000 |  |  |

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