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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 |  |

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