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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total sales	$ 699,582	$ 684,031	$ 1,234,609	$ 1,120,865
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales	554,364	554,782	918,566	856,250
Other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	83,036	68,180	177,541	133,446
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	637,400	622,962	1,096,107	989,696
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales	20,384	19,697	50,367	47,041
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales	26,678	25,504	54,997	50,901
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales	15,120	15,868	33,138	33,227
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales	$ 62,182	$ 61,069	$ 138,502	$ 131,169

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- Definition

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+ References

No definition available.

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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