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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2019
Jun. 02, 2017
May 31, 2018
May 31, 2019
May 31, 2017
Business Acquisition [Line Items]          
Goodwill     $ 345,183 $ 334,607 $ 247,673
Magna Industries, Inc.          
Business Acquisition [Line Items]          
Total consideration for acquired entity $ 13,500        
Business acquisition contingent consideration, estimated fair value 2,000        
Acquisition related costs 1,150        
Business combination , total intangible assets 3,677        
Goodwill $ 777        
AMTROL          
Business Acquisition [Line Items]          
Total consideration for acquired entity   $ 291,921      
Acquisition related costs   3,568 1,568    
Goodwill   $ 103,437      
Net sales     265,198    
Operating income     $ 18,899