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Business Combinations - Additional Information (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 04, 2014 USD ($) | Sep. 30, 2016 USD ($) PartnershipUnit | Sep. 30, 2015 USD ($) PartnershipUnit | Sep. 30, 2014 USD ($) PartnershipUnit
Business Acquisition [Line Items] |  |  |  |
Number of dealers acquired | PartnershipUnit |  | 4 | 2 | 3
Aggregate purchase price partnership acquired |  |  | $ 21,100 | $ 98,500
Aggregate purchase price allocation, intangible assets |  |  | 20,700 | 53,700
Goodwill |  | $ 212,760 | 211,045 | 209,331
Aggregate purchase price allocation, fixed assets |  |  | 2,500 | 17,600
Gross purchase price reduced by working capital credits |  |  | 2,100 | 27,200
Total Cash paid to acquire business |  | 9,815 | 21,130 | 98,463
Cash acquired |  | $ 0 | $ 0 | $ 4,151
Griffith Energy Services, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 8,168 |  |  |
Aggregate purchase price allocation, fixed assets | $ 17,263 |  |  |
Name of acquired entity |  | Griffith Energy Services, Inc. |  |
Percentage of voting equity interests acquired | 100.00% |  |  |
Total Cash paid to acquire business | $ 97,700 |  |  |
Cash paid to acquire business | 69,900 |  |  |
Working capital acquired, net of cash | 27,800 |  |  |
Cash acquired | $ 4,200 |  |  |
Heating Oil Dealer, Motor Fuel Dealer and Propane Dealer |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price partnership acquired |  | $ 9,800 |  |
Aggregate purchase price allocation, intangible assets |  | 5,700 |  |
Goodwill |  | 1,700 |  |
Aggregate purchase price allocation, fixed assets |  | 2,500 |  |
Gross purchase price reduced by working capital credits |  | $ 100 |  |
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Customer lists, other intangibles and trade names amortization period |  |  | 7 years |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Customer lists, other intangibles and trade names amortization period |  |  | 20 years |

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