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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2018 | Mar. 31, 2017 | Feb. 16, 2017 | Feb. 01, 2017 | Jan. 03, 2017 | Apr. 30, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Oct. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition of businesses, net of cash acquired |  |  |  |  |  |  | $ 45,364 | $ 805,943 |
Goodwill |  |  |  |  |  |  | 1,611,733 |  | $ 1,589,210
Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 1,194,935 |  | $ 1,172,857
Sonoscan, Inc. [Member] | 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired percent of the outstanding shares | 100.00% |  |  |  |  |  |  |  |
Acquisition of businesses, net of cash acquired | $ 46,018 |  |  |  |  |  |  |  |
Cash acquired from business acquisition | 641 |  |  |  |  |  |  |  |
Goodwill | 22,836 |  |  |  |  |  |  |  |
Identifiable intangible assets | 7,910 |  |  |  |  |  |  |  |
Sonoscan, Inc. [Member] | Customer Relationships [Member] | 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 1,700 |  |  |  |  |  |  |  |
Intangible assets amortization period | 7 years |  |  |  |  |  |  |  |
Sonoscan, Inc. [Member] | Trade Names [Member] | 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 3,300 |  |  |  |  |  |  |  |
Intangible assets amortization period | 11 years |  |  |  |  |  |  |  |
Sonoscan, Inc. [Member] | Technology-Based Intangible Assets [Member] | 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 2,500 |  |  |  |  |  |  |  |
Intangible assets amortization period | 7 years |  |  |  |  |  |  |  |
Sonoscan, Inc. [Member] | Non-compete Agreements [Member] | 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 410 |  |  |  |  |  |  |  |
Intangible assets amortization period | 5 years |  |  |  |  |  |  |  |
Vention [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition of businesses, net of cash acquired |  | $ 705,000 |  |  |  |  |  |  |
Cash acquired from business acquisition |  | 3,313 |  |  |  |  |  |  |
Goodwill |  | 434,123 |  |  |  |  |  |  |
Identifiable intangible assets |  | 286,000 |  |  |  |  |  |  |
Acquisition of businesses, Cash and other closing adjustments |  | 10,726 |  |  |  |  |  |  |
Business combination, goodwill, tax deductible amount |  | 37,200 |  |  |  |  |  |  |
Business acquisition material purchase price allocation adjustments |  |  |  |  |  | $ 0 |  |  |
Vention [Member] | Customer Relationships [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 240,000 |  |  |  |  |  |  |
Intangible assets amortization period |  | 14 years |  |  |  |  |  |  |
Vention [Member] | Trade Names [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 2,000 |  |  |  |  |  |  |
Intangible assets amortization period |  | 6 years |  |  |  |  |  |  |
Vention [Member] | Technology-Based Intangible Assets [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 44,000 |  |  |  |  |  |  |
Vention [Member] | Technology-Based Intangible Assets Amortized over 14 Years [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 36,000 |  |  |  |  |  |  |
Intangible assets amortization period |  | 14 years |  |  |  |  |  |  |
Vention [Member] | Technology-Based Intangible Assets Amortized over 10 Years [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 8,000 |  |  |  |  |  |  |
Intangible assets amortization period |  | 10 years |  |  |  |  |  |  |
InterSelect GmbH [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired percent of the outstanding shares |  |  | 100.00% |  |  |  |  |  |
Cash acquired from business acquisition |  |  | $ 492 |  |  |  |  |  |
Goodwill |  |  | 3,548 |  |  |  |  |  |
Identifiable intangible assets |  |  | 1,879 |  |  |  |  |  |
Acquisition of businesses, net of cash acquired |  |  | 5,432 |  |  |  |  |  |
InterSelect GmbH [Member] | Customer Relationships [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 1,109 |  |  |  |  |  |
Intangible assets amortization period |  |  | 9 years |  |  |  |  |  |
InterSelect GmbH [Member] | Trade Names [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 348 |  |  |  |  |  |
Intangible assets amortization period |  |  | 12 years |  |  |  |  |  |
InterSelect GmbH [Member] | Technology-Based Intangible Assets [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 422 |  |  |  |  |  |
Intangible assets amortization period |  |  | 9 years |  |  |  |  |  |
Plas-Pak Industries, Inc. [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired percent of the outstanding shares |  |  |  | 100.00% |  |  |  |  |
Acquisition of businesses, net of cash acquired |  |  |  | $ 70,798 |  |  |  |  |
Cash acquired from business acquisition |  |  |  | 543 |  |  |  |  |
Goodwill |  |  |  | 24,995 |  |  |  |  |
Identifiable intangible assets |  |  |  | 33,800 |  |  |  |  |
Plas-Pak Industries, Inc. [Member] | Customer Relationships [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 23,700 |  |  |  |  |
Intangible assets amortization period |  |  |  | 17 years |  |  |  |  |
Plas-Pak Industries, Inc. [Member] | Trade Names [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 4,100 |  |  |  |  |
Intangible assets amortization period |  |  |  | 12 years |  |  |  |  |
Plas-Pak Industries, Inc. [Member] | Technology-Based Intangible Assets [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 5,000 |  |  |  |  |
Intangible assets amortization period |  |  |  | 9 years |  |  |  |  |
Plas-Pak Industries, Inc. [Member] | Non-compete Agreements [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 1,000 |  |  |  |  |
Intangible assets amortization period |  |  |  | 5 years |  |  |  |  |
ACE Production Technologies Inc [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 6,383 |  |  |  |
Identifiable intangible assets |  |  |  |  | 5,010 |  |  |  |
Acquisition of businesses, net of cash acquired |  |  |  |  | 13,761 |  |  |  |
ACE Production Technologies Inc [Member] | Customer Relationships [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 2,800 |  |  |  |
Intangible assets amortization period |  |  |  |  | 7 years |  |  |  |
ACE Production Technologies Inc [Member] | Trade Names [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 1,000 |  |  |  |
Intangible assets amortization period |  |  |  |  | 11 years |  |  |  |
ACE Production Technologies Inc [Member] | Technology-Based Intangible Assets [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 1,100 |  |  |  |
Intangible assets amortization period |  |  |  |  | 7 years |  |  |  |
ACE Production Technologies Inc [Member] | Non-compete Agreements [Member] | 2017 Acquisition [Member] | Advanced Technology Systems [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 110 |  |  |  |
Intangible assets amortization period |  |  |  |  | 3 years |  |  |  |

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