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Goodwill and Other Intangible Assets - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2017
May 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
May 31, 2018
USD ($)
May 31, 2017
USD ($)
May 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
May 31, 2009
USD ($)
Goodwill And Intangible Assets [Line Items]                
Accumulated impairment losses   $ 156,300,000     $ 156,300,000 $ 14,900,000    
Impairment losses       $ 0 141,394,000      
Intangible asset amortization expense       43,200,000 41,900,000 40,500,000    
Future amortization expense of intangible asset in 2019       41,500,000        
Future amortization expense of intangible asset in 2020       39,100,000        
Future amortization expense of intangible asset in 2021       36,100,000        
Future amortization expense of intangible asset in 2022       34,800,000        
Future amortization expense of intangible asset in 2023       31,800,000        
Intangible asset impairment loss   0   0        
Goodwill   1,143,913,000   1,192,174,000 1,143,913,000 $ 1,219,630,000    
Restore Indefinite-lived Tradename                
Goodwill And Intangible Assets [Line Items]                
Intangible asset impairment loss     $ 4,900,000          
Indefinite-lived intangible assets, impairment loss         $ 4,900,000      
Amortized intangible assets, amortization period         10 years      
Restore Indefinite-lived Tradename | Sales Revenue, Net | Product Concentration Risk                
Goodwill And Intangible Assets [Line Items]                
Percentage of product to total sales           60.00%    
Kirker Reporting Unit                
Goodwill And Intangible Assets [Line Items]                
Impairment losses       140,500,000        
Intangible asset impairment loss         $ 46,000,000      
Fair value in excess of carrying value           8.00%    
Percentage of loss on sales 15.00%              
Goodwill             $ 0  
Kirker Reporting Unit | Trademarks and Trade Names                
Goodwill And Intangible Assets [Line Items]                
Indefinite-lived intangible assets, impairment loss         2,100,000      
Recalculated fair value of identifiable indefinite-lived intangible assets       $ 5,800,000        
Kirker Reporting Unit | Measurement Input Long-term Revenue Growth Rate                
Goodwill And Intangible Assets [Line Items]                
Assumed long-term earnings growth rate       3.0        
Kirker Reporting Unit | Measurement Input Discount Rate                
Goodwill And Intangible Assets [Line Items]                
Assumed long-term earnings growth rate       8.0        
Consumer Segment                
Goodwill And Intangible Assets [Line Items]                
Accumulated impairment losses   141,400,000     141,400,000      
Impairment losses         141,394,000      
Intangible asset impairment loss         53,000,000      
Goodwill   453,600,000   $ 477,718,000 453,600,000 $ 572,507,000    
Industrial Segment                
Goodwill And Intangible Assets [Line Items]                
Accumulated impairment losses               $ 14,900,000
Other intangible asset accumulated impairment losses, gross           600,000    
Goodwill   $ 516,335,000   $ 537,318,000 516,335,000 $ 475,409,000    
Formulas                
Goodwill And Intangible Assets [Line Items]                
Intangible asset impairment loss         15,500,000      
Customer-related Intangibles                
Goodwill And Intangible Assets [Line Items]                
Intangible asset impairment loss         30,400,000      
Indefinite Trademarks                
Goodwill And Intangible Assets [Line Items]                
Intangible asset impairment loss         6,900,000      
Other Intangibles                
Goodwill And Intangible Assets [Line Items]                
Intangible asset impairment loss         $ 200,000