Acquisitions - Summary of Identifiable Intangible Assets (Detail) - IWT [Member] $ in Thousands	Jul. 31, 2019 USD ($)
Business Acquisition [Line Items]
Total identifiable intangible assets, Preliminary fair value	$ 575,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Total identifiable intangible assets, Preliminary fair value	$ 360,000
Intangible asset, useful life	20 years
Patents and Developed Technology [Member]
Business Acquisition [Line Items]
Total identifiable intangible assets, Preliminary fair value	$ 150,000
Intangible asset, useful life	10 years
Tradename and Trademarks [Member]
Business Acquisition [Line Items]
Total identifiable intangible assets, Preliminary fair value	$ 65,000
Intangible asset, useful life	20 years