XML 71 R57.htm IDEA: XBRL DOCUMENT v3.8.0.1
Business Combinations - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
USD ($)
PartnershipUnit
Sep. 30, 2016
USD ($)
PartnershipUnit
Sep. 30, 2015
USD ($)
PartnershipUnit
Business Acquisition [Line Items]      
Aggregate purchase price partnership acquired     $ 21,100
Aggregate purchase price allocation, intangible assets     20,700
Aggregate purchase price allocation, fixed assets     2,500
Gross purchase price reduced by working capital credits     $ (2,100)
Number of dealers acquired | PartnershipUnit 7 4 2
Goodwill $ 225,915 $ 212,760 $ 211,045
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider      
Business Acquisition [Line Items]      
Aggregate purchase price partnership acquired 44,800    
Cash paid 43,300    
Deferred liabilities 1,500    
Contingent consideration 600    
Aggregate purchase price allocation, intangible assets 37,500    
Aggregate purchase price allocation, fixed assets 10,200    
Gross purchase price reduced by working capital credits $ (2,900)    
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  
Aggregate purchase price allocation, fixed assets   2,500  
Gross purchase price reduced by working capital credits   (100)  
Goodwill   $ 1,700