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Acquisitions - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) Employee | Jun. 30, 2015 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) | Jul. 07, 2015 USD ($) | May. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, goodwill |  |  |  | $ 262,194 |  |  | $ 107,773
Business acquisition total consideration, net of cash acquired |  |  |  | $ 263,560 | $ 2,151 |  |
Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible asset useful life | 1 year |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible asset useful life | 15 years |  |  |  |  |  |
Mechanical Service [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, purchase price |  | $ 12,600 |  |  |  |  |
Business acquisition, contingent consideration |  | 2,000 |  |  |  |  |
Business acquisitions, cash acquired |  | 100 |  |  |  |  |
Business acquisition, net working capital |  | 3,000 |  |  |  |  |
Business acquisition, fixed assets |  | 600 |  |  |  |  |
Business acquisition, goodwill and intangible assets |  | 9,100 |  |  |  |  |
Business acquisition, goodwill |  | $ 4,100 |  |  |  |  |
Business acquisition, contingent consideration thresholds period |  | 3 years |  |  |  |  |
Business acquisition, contingent consideration based upon achievement of performance targets |  | $ 4,000 |  |  |  |  |
Mechanical Service [Member] | United Kingdom [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, contingent consideration |  |  | $ 300 |  | 300 |  |
Business acquisitions, cash acquired |  |  | 200 |  |  |  |
Business acquisition, goodwill and intangible assets |  |  | 1,000 |  | 1,000 |  |
Business acquisition total consideration, net of cash acquired |  |  | 3,100 |  |  |  |
Business acquisition, allocated to fixed assets and net working capital |  |  | $ 2,100 |  | $ 2,100 |  |
Qualspec Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, purchase price | $ 257,000 |  |  |  |  |  |
Business acquisition, contingent consideration | 10,000 |  |  |  |  |  |
Increase in revenue due to acquisition | $ 180,000 |  |  |  |  |  |
Number of employees added | Employee | 1,000 |  |  |  |  |  |
Business acquisition, fixed assets |  |  |  |  |  | $ 15,472 |
Business acquisition, goodwill |  |  |  |  |  | $ 151,732 |

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