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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 15, 2015 | Jul. 31, 2015 | Oct. 31, 2014
Business Acquisition [Line Items] |  |  |
Acquisition of businesses, net of cash acquired |  | $ 14,936 |
Goodwill |  | 1,047,086 | $ 1,052,537
Advanced Technology Systems [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 640,727 | $ 631,433
Advanced Technology Systems [Member] | Liquidyn [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired percent of the outstanding shares | 100.00% |  |
Acquisition of businesses, net of cash acquired | $ 14,565 |  |
Cash acquired from business acquisition | 656 |  |
Goodwill | 10,725 |  |
Identifiable intangible assets | 3,991 |  |
Advanced Technology Systems [Member] | Liquidyn [Member] | Customer Relationships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 1,285 |  |
Intangible assets amortization period | 6 years |  |
Advanced Technology Systems [Member] | Liquidyn [Member] | Trade Names [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 1,049 |  |
Intangible assets amortization period | 11 years |  |
Advanced Technology Systems [Member] | Liquidyn [Member] | Technology-Based Intangible Assets [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 1,421 |  |
Intangible assets amortization period | 5 years |  |
Advanced Technology Systems [Member] | Liquidyn [Member] | Non-compete Agreements [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable intangible assets | $ 236 |  |
Intangible assets amortization period | 2 years |  |

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