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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 17, 2018 | Jan. 02, 2018 | Apr. 30, 2019 | Apr. 30, 2020 | Oct. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of businesses, net of cash acquired |  |  | $ 69 |  |
Goodwill |  |  |  | $ 1,611,340 | $ 1,614,739
Cladach Nua Teoranta [Member] | 2018 Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired percent of the outstanding shares | 100.00% |  |  |  |
Acquisition of businesses, net of cash acquired | $ 5,236 |  |  |  |
Acquisition of business, earn-out liability | 1,131 |  |  |  |
Goodwill | 3,776 |  |  |  |
Identifiable intangible assets | 697 |  |  |  |
Cladach Nua Teoranta [Member] | Customer Relationships [Member] | 2018 Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 58 |  |  |  |
Intangible assets amortization period | 6 years |  |  |  |
Cladach Nua Teoranta [Member] | Trade Names [Member] | 2018 Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 70 |  |  |  |
Intangible assets amortization period | 9 years |  |  |  |
Cladach Nua Teoranta [Member] | Technology-Based Intangible Assets [Member] | 2018 Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 499 |  |  |  |
Intangible assets amortization period | 7 years |  |  |  |
Cladach Nua Teoranta [Member] | Non-compete Agreements [Member] | 2018 Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Identifiable intangible assets | $ 70 |  |  |  |
Intangible assets amortization period | 3 years |  |  |  |
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 |  |  |
Goodwill |  | 22,775 |  |  |
Identifiable intangible assets |  | 7,910 |  |  |
Cash acquired from business acquisition |  | 655 |  |  |
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 |  |  |

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