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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, 2017
Mar. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Assets acquired:        
Goodwill $ 1,589,210   $ 1,107,137 $ 1,082,375
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   434,625    
Intangible assets   286,000    
Other assets   343    
Total assets acquired   802,700    
Liabilities assumed:        
Current liabilities   19,130    
Deferred tax liabilities   64,531    
Total liabilities assumed   83,661    
Net assets acquired   $ 719,039