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Business Combinations - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
PartnershipUnit
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]          
Goodwill $ 247,341   $ 247,341   $ 228,436
Total sales 283,376 $ 327,354 1,517,985 $ 1,448,219  
Net earnings before income taxes (33,153) $ (11,421) $ 71,699 $ 100,032  
Liquid Product Dealers          
Business Acquisition [Line Items]          
Number of dealers acquired | PartnershipUnit     2    
Acquired Business          
Business Acquisition [Line Items]          
Aggregate purchase price partnership acquired     $ 62,807    
Goodwill $ 18,905   18,905    
Total sales     7,100    
Net earnings before income taxes     $ 100    
Acquired Business | Minimum | Customer Lists, Other Intangibles and Trade Names          
Business Acquisition [Line Items]          
Intangible assets, amortization period     10 years    
Acquired Business | Maximum | Customer Lists, Other Intangibles and Trade Names          
Business Acquisition [Line Items]          
Intangible assets, amortization period     20 years    
Acquired Business | General and Administrative Expenses          
Business Acquisition [Line Items]          
Total acquisition expenses     $ 1,200