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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2018 | Mar. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition of businesses, net of cash acquired |  |  |  | $ 44,176 | $ 805,218 |
Goodwill |  |  | $ 1,616,800 | 1,616,800 |  | $ 1,589,210
Term loan facility |  |  | 1,539,046 | 1,539,046 |  |
Advanced Technology Systems [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 1,196,176 | $ 1,196,176 |  | $ 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 | $ 44,832 |  |  |  |  |
Cash acquired from business acquisition | 656 |  |  |  |  |
Goodwill | 21,363 |  |  |  |  |
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] | Term Loan Facility [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Term loan facility |  | $ 705,000 |  |  |  |
Term loan facility due in September 2018 |  | 200,000 |  |  |  |
Term loan facility due in March 2020 |  | 200,000 |  |  |  |
Term loan facility due in March 2022 |  | 305,000 |  |  |  |
Weighted average interest rate for borrowings |  |  | 2.99% | 2.99% |  |
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 |  |  |  |

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