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Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total sales	$ 283,100	$ 232,155	$ 1,260,535	$ 1,284,163
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales	111,451	120,951	818,664	877,763
Other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	93,594	44,231	226,084	201,382
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	205,045	165,182	1,044,748	1,079,145
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales	28,525	21,548	81,450	72,271
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales	32,196	32,541	86,109	88,213
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales	17,334	12,884	48,228	44,534
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales	$ 78,055	$ 66,973	$ 215,787	$ 205,018

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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.

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