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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, 2018
Oct. 31, 2017
Mar. 31, 2017
Oct. 31, 2016
Assets acquired:        
Goodwill $ 1,608,018 $ 1,589,210   $ 1,107,137
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