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Acquisition and Disposition of Businesses - Additional Information (Details)
$ in Thousands
3 Months Ended 8 Months Ended 9 Months Ended
Apr. 05, 2018
USD ($)
Dec. 08, 2017
USD ($)
Nov. 07, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 24, 2017
USD ($)
Business Acquisition And Dispositions [Line Items]                
Business acquisition, cost of acquired, cash paid $ 11,900   $ 4,871          
Cash paid to acquire business       $ 10,622   $ 4,251 $ 14,873 $ 0
Business disposition, sales price   $ 2,800            
Loss on sale of certain assets and operations         $ 4,823   $ 4,823 $ 0
Number of propane assets and operations acquired 2              
Non-compete Agreements [Member]                
Business Acquisition And Dispositions [Line Items]                
Business acquisition, cost of acquired, cash paid $ 1,750   $ 750