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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Total sales	$ 235,887	$ 283,376	$ 699,582	$ 535,027	$ 229,618	$ 327,354	$ 684,031	$ 436,834	$ 1,753,872	$ 1,677,837	$ 1,323,555
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales									1,099,874	1,084,827	854,067
Motor fuel and other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									366,172	319,543	211,009
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales									1,466,045	1,404,370	1,065,076
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales									101,709	98,064	94,961
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales									120,138	111,361	105,565
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales									65,980	64,042	57,953
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales									$ 287,827	$ 273,467	$ 258,479

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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