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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, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total sales	$ 543,063	$ 699,582	$ 1,052,008	$ 1,234,609
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales	413,466	554,364	756,812	918,566
Other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	67,809	83,036	157,151	177,541
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	481,275	637,400	913,963	1,096,107
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales	20,158	20,384	50,723	50,367
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales	27,764	26,678	55,672	54,997
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales	13,866	15,120	31,650	33,138
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales	$ 61,788	$ 62,182	$ 138,045	$ 138,502

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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://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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