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Acquisitions - Summary of Preliminary Fair Values of the Assets Acquired and Liabilities Assumed at the Acquisition Date (Detail) - USD ($)
$ in Thousands
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Mar. 31, 2017
Assets acquired:        
Goodwill $ 1,614,739 $ 1,608,018 $ 1,589,210  
2017 Acquisition [Member]        
Assets acquired:        
Cash       $ 3,313
Receivables       26,742
Inventories       14,279
Prepaid expenses       3,079
Property, plant and equipment       34,319
Goodwill       434,123
Intangible assets       286,000
Other assets       1,071
Total assets acquired       802,926
Liabilities assumed:        
Current liabilities       19,130
Deferred tax liabilities       64,757
Total liabilities assumed       83,887
Net assets acquired       $ 719,039