Star (SGU) 10-Q 1 Feb 23 2023 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2022	Jan. 31, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Trading Symbol	SGU
Title of 12(b) Security	Common Units
Security Exchange Name	NYSE
Entity Registrant Name	STAR GROUP, L.P.
Entity Central Index Key	0001002590
Entity Tax Identification Number	06-1437793
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-14129
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		35,681,040
Entity Address, Address Line One	9 West Broad Street
Entity Address, City or Town	Stamford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06902
City Area Code	(203)
Local Phone Number	328-7310

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2022	Sep. 30, 2022
Current assets
Cash and cash equivalents		$ 22,591	$ 14,620
Receivables, net of allowance of $8,400 and $7,755, respectively		253,004	138,252
Inventories		112,058	83,557
Fair asset value of derivative instruments		2,904	16,823
Prepaid expenses and other current assets		35,111	32,016
Assets held for sale		0	2,995
Total current assets		425,668	288,263
Property and equipment, net		106,672	107,744
Operating lease right-of-use assets		93,696	93,435
Goodwill		254,354	254,110
Intangibles, net		81,772	84,510
Restricted cash		250	250
Captive insurance collateral		67,222	66,662
Deferred charges and other assets, net		17,010	17,501
Total assets		1,046,644	912,475
Current liabilities
Accounts payable		70,927	49,061
Revolving credit facility borrowings		136,574	20,276
Fair liability value of derivative instruments		4,720	183
Current maturities of long-term debt		16,500	12,375
Current portion of operating lease liabilities		17,439	17,211
Accrued expenses and other current liabilities		120,152	125,561
Unearned service contract revenue		74,705	62,858
Customer credit balances		79,100	93,555
Total current liabilities		520,117	381,080
Long-term debt	[1]	143,522	151,709
Long-term operating lease liabilities		81,387	81,385
Deferred tax liabilities, net		24,465	25,620
Other long-term liabilities		14,780	14,766
Partners’ capital
Common unitholders		281,516	277,177
General partner		(3,826)	(3,656)
Accumulated other comprehensive loss, net of taxes		(15,317)	(15,606)
Total partners’ capital		262,373	257,915
Total liabilities and partners’ capital		$ 1,046,644	$ 912,475
[1] Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Statement of Financial Position [Abstract]
Receivables, allowance	$ 8,400	$ 7,755

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Sales:
Total sales		$ 648,187	$ 488,270
Cost and expenses:
(Increase) decrease in the fair value of derivative instruments	[1]	17,636	13,403
Delivery and branch expenses		97,936	88,989
Depreciation and amortization expenses		7,837	8,448
General and administrative expenses		6,856	6,676
Finance charge income		(1,319)	(512)
Operating income		23,605	22,624
Interest expense, net		(4,274)	(2,058)
Amortization of debt issuance costs		(329)	(239)
Income before income taxes		19,002	20,327
Income tax expense		5,463	5,838
Net income		13,539	14,489
General Partner's interest in net income		122	122
Limited Partners' interest in net income		$ 13,417	$ 14,367
Basic and diluted income per Limited Partner Unit (1):		$ 0.33	$ 0.32
Weighted average number of Limited Partner units outstanding:
Weighted average number of Limited Partner units outstanding, Basic		35,916	38,789
Weighted average number of Limited Partner units outstanding, Diluted		35,916	38,789
Product
Sales:
Total sales		$ 569,929	$ 411,265
Installations and services
Sales:
Total sales		78,258	77,005
Cost of product
Cost and expenses:
Cost and expenses		419,093	274,594
Cost of installations and services
Cost and expenses:
Cost and expenses		$ 76,543	$ 74,048
[1] Represents the change in value of unrealized open positions and expired options.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 13,539	$ 14,489
Other comprehensive income:
Unrealized gain on pension plan obligation	380	224
Tax effect of unrealized gain on pension plan obligation	(97)	(45)
Unrealized gain (loss) on captive insurance collateral	355	(612)
Tax effect of unrealized gain (loss) on captive insurance collateral	(74)	129
Unrealized gain (loss) on interest rate hedges	(377)	718
Tax effect of unrealized gain (loss) on interest rate hedges	102	(193)
Total other comprehensive income	289	221
Total comprehensive income	$ 13,828	$ 14,710

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands	Total	General Partner	Common Stock	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Sep. 30, 2021	$ 278,204	$ (2,821)	$ 295,063	$ (14,038)
Beginning Balance, unit at Sep. 30, 2021		326	39,046
Net income	14,489	$ 122	$ 14,367
Unrealized gain on pension plan obligation	224			224
Tax effect of unrealized gain on pension plan obligation	(45)			(45)
Unrealized gain (loss) on captive insurance collateral	(612)			(612)
Tax effect of unrealized gain (loss) on captive insurance collateral	129			129
Unrealized gain (loss) on interest rate hedges	718			718
Tax effect of unrealized gain (loss) on interest rate hedges	(193)			(193)
Distributions	(5,790)	(264)	(5,526)
Retirement of units	(11,765)		$ (11,765)
Retirement of units, shares			(1,104)
Ending Balance at Dec. 31, 2021	275,359	$ (2,963)	$ 292,139	(13,817)
Ending Balance, Unit at Dec. 31, 2021		326	37,942
Beginning Balance at Sep. 30, 2022	257,915	$ (3,656)	$ 277,177	(15,606)
Beginning Balance, unit at Sep. 30, 2022		326	36,092
Net income	13,539	$ 122	$ 13,417
Unrealized gain on pension plan obligation	380			380
Tax effect of unrealized gain on pension plan obligation	(97)			(97)
Unrealized gain (loss) on captive insurance collateral	355			355
Tax effect of unrealized gain (loss) on captive insurance collateral	(74)			(74)
Unrealized gain (loss) on interest rate hedges	(377)			(377)
Tax effect of unrealized gain (loss) on interest rate hedges	102			102
Distributions	(5,774)	(292)	(5,482)
Retirement of units	(3,596)		$ (3,596)
Retirement of units, shares			411
Ending Balance at Dec. 31, 2022	$ 262,373	$ (3,826)	$ 281,516	$ (15,317)
Ending Balance, Unit at Dec. 31, 2022		326	35,681

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Cash flows provided by (used in) operating activities:
Net income		$ 13,539	$ 14,489
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	17,636	13,403
Depreciation and amortization		8,166	8,687
Provision (recovery) for losses on accounts receivable		1,046	(288)
Change in deferred taxes		(1,224)	(684)
Change in weather hedge contracts		350	(2,188)
Changes in operating assets and liabilities:
Increase in receivables		(115,164)	(78,794)
Increase in inventories		(28,717)	(16,388)
Increase in other assets		(2,005)	(16,767)
Increase in accounts payable		22,366	15,442
Decrease in customer credit balances		(14,700)	(14,504)
Increase in other current and long-term liabilities		5,966	11,727
Net cash used in operating activities		(92,741)	(65,865)
Cash flows provided by (used in) investing activities:
Capital expenditures		(3,095)	(3,787)
Proceeds from sales of fixed assets		215	254
Proceeds from sale of certain assets		2,202
Purchase of investments		(215)	(175)
Acquisitions		(1,193)	(3,326)
Net cash used in investing activities		(2,086)	(7,034)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		116,298	115,064
Term loan repayments		(4,125)	(7,871)
Distributions		(5,774)	(5,790)
Unit repurchases		(3,596)	(11,765)
Customer retainage payments		(5)	(267)
Net cash provided by financing activities		102,798	89,371
Net increase in cash, cash equivalents, and restricted cash		7,971	16,472
Cash, cash equivalents, and restricted cash at beginning of period		14,870	5,017
Cash, cash equivalents, and restricted cash at end of period		$ 22,841	$ 21,489
[1] Represents the change in value of unrealized open positions and expired options.

Organization

Organization	3 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Organization	1) Organization Star Group, L.P. (“Star,” the “Company,” “we,” “us,” or “our”) is a full service provider specializing in the sale of home heating and air conditioning products and services to residential and commercial home heating oil and propane customers. The Company has one reportable segment for accounting purposes. We also sell diesel fuel, gasoline and home heating oil on a delivery only basis. We believe we are the nation’s largest retail distributor of home heating oil based upon sales volume. The Company is organized as follows: • Star is a limited partnership, which at December 31, 2022, had outstanding 35.7 million Common Units (NYSE: “SGU”), representing a 99.1 % limited partner interest in Star, and 0.3 million general partner units, representing a 0.9 % general partner interest in Star. Our general partner is Kestrel Heat, LLC, a Delaware limited liability company (“Kestrel Heat” or the “general partner”). The Board of Directors of Kestrel Heat (the “Board”) is appointed by its sole member, Kestrel Energy Partners, LLC, a Delaware limited liability company (“Kestrel”). Although Star is a partnership, it is taxed as a corporation and its distributions to unitholders are treated as taxable dividends. • Star owns 100 % of Star Acquisitions, Inc. (“SA”), a Minnesota corporation that owns 100 % of Petro Holdings, Inc. (“Petro”). SA and its subsidiaries are subject to Federal and state corporate income taxes. Star’s operations are conducted through Petro and its subsidiaries. Petro is primarily a Northeast and Mid-Atlantic U.S. region retail distributor of home heating oil and propane that at December 31, 2022 served approximately 421,000 full service residential and commercial home heating oil and propane customers and 76,400 customers on a delivery only basis. We also sell gasoline and diesel fuel to approximately 26,900 customers. We install, maintain, and repair heating and air conditioning equipment and to a lesser extent provide these services outside our heating oil and propane customer base including approximately 20,000 service contracts for natural gas and other heating systems. • Petroleum Heat and Power Co., Inc. (“PH&P”) is a wholly owned subsidiary of Star. PH&P is the borrower and Star is the guarantor of the sixth amended and restated credit agreement’s $ 165 million five-year senior secured term loan and the $ 400 million ($ 550 million during the heating season of December through April of each year) revolving credit facility, both due July 6, 2027 . (See Note 11—Long-Term Debt and Bank Facility Borrowings).

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2) Summary of Significant Accounting Policies Basis of Presentation The Consolidated Financial Statements include the accounts of Star and its subsidiaries. All material intercompany items and transactions have been eliminated in consolidation. The financial information included herein is unaudited; however, such information reflects all adjustments (consisting solely of normal recurring adjustments), which are, in the opinion of management, necessary for the fair statement of financial condition and results for the interim periods. Due to the seasonal nature of the Company’s business, the results of operations and cash flows for the three-month period ended December 31, 2022 are not necessarily indicative of the results to be expected for the full year. These interim financial statements of the Company have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information and Rule 10-01 of Regulation S-X of the U.S. Securities and Exchange Commission (the “SEC”) and should be read in conjunction with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended September 30, 2022. Comprehensive Income Comprehensive income is comprised of Net income and Other comprehensive income. Other comprehensive income consists of the unrealized gain on amortization on the Company’s pension plan obligation for its two frozen defined benefit pension plans, unrealized gain (loss) on available-for-sale investments, unrealized gain (loss) on interest rate hedges and the corresponding tax effects. Cash, Cash Equivalents, and Restricted Cash The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. At December 31, 2022, the $ 22.8 million of cash, cash equivalents, and restricted cash on the Condensed Consolidated Statements of Cash Flows is composed of $ 22.6 million of cash and cash equivalents and $ 0.3 million of restricted cash. At September 30, 2022, the $ 14.9 million of cash, cash equivalents, and restricted cash on the Condensed Consolidated Statements of Cash Flows is composed of $ 14.6 million of cash and cash equivalents and $ 0.3 million of restricted cash. Restricted cash represents deposits held by our captive insurance company that are required by state insurance regulations to remain in the captive insurance company as cash. Assets Held for Sale Assets held for sale at September 30, 2022 represent certain heating oil assets that the Company sold on October 25, 2022. The carrying amount of the assets held for sale included $ 2.2 million of goodwill and $ 0.8 million of property and equipment, net. We measure and record assets held for sale at the lower of their carrying amount or fair value less cost to sell. The carrying amounts of the assets held for sale approximated their fair value at September 30, 2022. Fair Value Valuation Approach The Company uses valuation approaches that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. The Company determines fair value based on assumptions that market participants would use in pricing an asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: • Level 1 inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date. • Level 2 inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. • Level 3 inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date. Captive Insurance Collateral The captive insurance collateral is held by our captive insurance company in an irrevocable trust as collateral for certain workers’ compensation and automobile liability claims. The collateral is required by a third party insurance carrier that insures per claim amounts above a set deductible. If we did not deposit cash into the trust, the third party carrier would require that we issue an equal amount of letters of credit, which would reduce our availability under the sixth amended and restated credit agreement. Due to the expected timing of claim payments, the nature of the collateral agreement with the carrier, and our captive insurance company’s source of other operating cash, the collateral is not expected to be used to pay obligations within the next twelve months. Unrealized gains and losses, net of related income taxes, are reported as accumulated other comprehensive income (loss), except for losses from impairments which are determined to be other-than-temporary. Realized gains and losses, and declines in value judged to be other-than-temporary on available-for-sale securities are included in the determination of net income and are included in Interest expense, net, at which time the average cost basis of these securities are adjusted to fair value. Weather Hedge Contract To partially mitigate the adverse effect of warm weather on cash flows, the Company has used weather hedge contracts for a number of years. Weather hedge contracts are recorded in accordance with the intrinsic value method defined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 815-45-15 Derivatives and Hedging, Weather Derivatives (EITF 99-2). The premium paid is included in the caption “Prepaid expenses and other current assets” in the accompanying balance sheets and amortized over the life of the contract, with the intrinsic value method applied at each interim period. The Company entered into weather hedge contracts for fiscal year 2023. The hedge period runs from November 1 through March 31, taken as a whole. The “Payment Thresholds,” or strikes, are set at various levels and are referenced against degree days for the prior ten year average. The maximum amount the Company can receive is $ 12.5 million per year. In addition, we are obligated to make an annual payment capped at $ 5.0 million if degree days exceed the Payment Threshold. The temperatures experienced during the hedge period through December 31, 2022 were colder than the strikes in the weather hedge contracts. As a result the Company recorded a payable at December 31, 2022 of $ 0.4 million that increased delivery and branch expenses by a corresponding amount, and a receivable of $ 2.2 million at December 31, 2021 that reduced delivery and branch expenses by a corresponding amount. New England Teamsters and Trucking Industry Pension Fund (“the NETTI Fund”) Liability As of December 31, 2022, we had $ 0.3 million and $ 16.2 million balances included in the captions “Accrued expenses and other current liabilities” and “Other long-term liabilities,” on our Condensed Consolidated Balance Sheet representing the remaining balance of the NETTI Fund withdrawal liability. As of September 30, 2022, we had $ 0.3 million and $ 16.2 million balances reflected in these categories respectively. Based on the borrowing rates currently available to the Company for long-term financing of a similar maturity, the fair value of the NETTI Fund withdrawal liability as of December 31, 2022 and September 30, 2022 was $ 20.0 million and $ 20.2 million, respectively. We utilized Level 2 inputs in the fair value hierarchy of valuation techniques to determine the fair value of this liability. Recently Adopted Accounting Pronouncements In December 2022, the FASB issued ASU No. 2022-06, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The Company adopted the ASU effective December 31, 2022. The update extends the sunset of Topic 848 from December 31, 2022 to December 31, 2024. The guidance provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as interbank offered rates and LIBOR. The Company has $ 52.8 million of interest rate swap agreements at December 31, 2022 that are benchmarked against LIBOR, which the Company has designated as cash flow hedging derivatives. This guidance includes practical expedients for contract modifications due to reference rate reform. The Company has elected to adopt the practical expedient that the Company may change the contractual terms of the interest rate swap agreements that are expected to be affected by reference rate reform and not be required to de-designate the hedging relationships. The adoption did not have an impact on the Company’s consolidated financial statements and related disclosures. Recently Issued Accounting Pronouncements In October 2021, the FASB issued ASU No. 2021-08, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires accounting for contract assets and liabilities from contracts with customers in a business combination to be accounted for in accordance with ASC No. 606. The standard is effective for fiscal years beginning after December 15, 2022. The Company has not determined the timing of adoption, but does not expect ASU 2021-08 to have a material impact on its consolidated financial statements and related disclosures.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue Recognition	3) Revenue Recognition The following disaggregates our revenue by major sources for the three months ended December 31, 2022 and December 31, 2021: Three Months (in thousands) 2022 2021 Petroleum Products: Home heating oil and propane $ 435,523 $ 305,723 Other petroleum products 134,406 105,542 Total petroleum products 569,929 411,265 Installations and Services: Equipment installations 32,789 33,069 Equipment maintenance service contracts 28,716 26,977 Billable call services 16,753 16,959 Total installations and services 78,258 77,005 Total Sales $ 648,187 $ 488,270 Deferred Contract Costs We recognize an asset for incremental commission expenses paid to sales personnel in conjunction with obtaining new residential customer product and equipment maintenance service contracts. We defer these costs only when we have determined the commissions are, in fact, incremental and would not have been incurred absent the customer contract. Costs to obtain a contract are amortized and recorded ratably as delivery and branch expenses over the period representing the transfer of goods or services to which the assets relate. Costs to obtain new residential product and equipment maintenance service contracts are amortized as expense over the estimated customer relationship period of approximately five years . Deferred contract costs are classified as current or non-current within “Prepaid expenses and other current assets” and “Deferred charges and other assets, net,” respectively. At December 31, 2022, the amount of deferred contract costs included in “Prepaid expenses and other current assets” and “Deferred charges and other assets, net” was $ 3.5 million and $ 6.4 million, respectively. At September 30, 2022, the amount of deferred contract costs included in “Prepaid expenses and other current assets” and “Deferred charges and other assets, net” was $ 3.4 million and $ 5.6 million, respectively. For the three months ended December 31, 2022 and December 31, 2021 we recognized expense of $ 1.0 million associated with the amortization of deferred contract costs within “Delivery and branch expenses” in the Condensed Consolidated Statement of Operations. Contract Liability Balances The Company has contract liabilities for advanced payments received from customers for future oil deliveries (primarily amounts received from customers on “smart pay” budget payment plans in advance of oil deliveries) and obligations to service customers with equipment maintenance service contracts. Contract liabilities are recognized straight-line over the service contract period, generally one year or less. As of December 31, 2022 and September 30, 2022 the Company had contract liabilities of $ 149.1 million and $ 152.1 million, respectively. During the three months ended December 31, 2022, the Company recognized $ 85.6 million of revenue that was included in the September 30, 2022 contract liability balance. During the three months ended December 31, 2021 the Company recognized $ 73.0 million of revenue that was included in the September 30, 2021 contract liability balance. Receivables and Allowance for Doubtful Accounts Accounts receivables from customers are recorded at the invoiced amounts. Finance charges may be applied to trade receivables that are more than 30 days past due, and are recorded as finance charge income. The allowance for doubtful accounts is the Company’s estimate of the amount of trade receivables that may not be collectible. The allowance is determined at an aggregate level by grouping accounts based on certain account criteria and its receivable aging. The allowance is based on both quantitative and qualitative factors, including historical loss experience, historical collection patterns, overdue status, aging trends, current and future economic conditions. The Company has an established process to periodically review current and past due trade receivable balances to determine the adequacy of the allowance. No single statistic or measurement determines the adequacy of the allowance. The total allowance reflects management’s estimate of losses inherent in its trade receivables at the balance sheet date. Different assumptions or changes in economic conditions could result in material changes to the allowance for doubtful accounts. Changes in the allowance for credit losses are as follows: (in thousands) Credit Loss Allowance Balance at September 30, 2022 $ 7,755 Current period provision 1,046 Write-offs, net and other ( 401 ) Balance as of December 31, 2022 $ 8,400

Common Unit Repurchase and Reti

Common Unit Repurchase and Retirement	3 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Common Unit Repurchase and Retirement	4) Common Unit Repurchase and Retirement In July 2012, the Board adopted a plan to repurchase certain of the Company’s Common Units (the “Repurchase Plan”). Through August 2022, the Company had repurchased approximately 19.9 million Common Units under the Repurchase Plan. In August 2022, the Board authorized an increase of the number of Common Units that remained available for the Company to repurchase from 0.4 million to a total of 1.7 million, of which, 1.4 million were available for repurchase in open market transactions and 0.3 million were available for repurchase in privately-negotiated transactions. There is no guarantee of the number of units that will be purchased under the Repurchase Plan and the Company may discontinue purchases at any time. The Repurchase Plan does not have a time limit. The Board may also approve additional purchases of units from time to time in private transactions. The Company’s repurchase activities take into account SEC safe harbor rules and guidance for issuer repurchases. All of the Common Units purchased under the Repurchase Plan will be retired. Under the Company’s sixth amended and restated credit agreement dated July 6, 2022, in order to pay distributions and repurchase Common Units, we must maintain Availability (as defined in the sixth amended and restated credit agreement) of $ 60 million, 15.0 % of the facility size of $ 400 million (assuming no borrowings under the seasonal advance) on a historical pro forma and forward-looking basis, and a fixed charge coverage ratio of not less than 1.15 measured as of the date of repurchase or distribution. (See Note 11—Long-Term Debt and Bank Facility Borrowings) The following table shows repurchases under the Repurchase Plan: (in thousands, except per unit amounts) Period Total Number of Average Price Total Number of Maximum Number Fiscal year 2012 to 2022 total 24,933 $ 8.82 20,045 1,557 October 2022 154 $ 8.45 154 1,403 November 2022 167 $ 8.71 167 1,236 December 2022 90 $ 9.45 90 1,146 First quarter fiscal year 2023 total 411 $ 8.77 411 1,146 January 2023 — $ — — 1,146 (b) (a) Amount includes repurchase costs. (b) Of the total available for repurchase, approximately 0.8 million units are available for repurchase in open market transactions and 0.3 million units are available for repurchase in privately-negotiated transactions, under the Repurchase Plan.

Captive Insurance Collateral

Captive Insurance Collateral	3 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Captive Insurance Collateral	5) Captive Insurance Collateral The Company considers all of its captive insurance collateral to be Level 1 available-for-sale investments. Investments at December 31, 2022 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 573 $ — $ — $ 573 U.S. Government Sponsored Agencies 49,972 — ( 2,803 ) 47,169 Corporate Debt Securities 20,293 — ( 813 ) 19,480 Total $ 70,838 $ — $ ( 3,616 ) $ 67,222 Investments at September 30, 2022 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 1,838 $ — $ — $ 1,838 U.S. Government Sponsored Agencies 48,473 — ( 3,052 ) 45,421 Corporate Debt Securities 20,322 — ( 919 ) 19,403 Total $ 70,633 $ — $ ( 3,971 ) $ 66,662 Maturities of investments were as follows at December 31, 2022 (in thousands): Net Carrying Amount Due within one year $ 19,935 Due after one year through five years 47,287 Due after five years through ten years — Total $ 67,222

Derivatives and Hedging-Disclos

Derivatives and Hedging-Disclosures and Fair Value Measurements	3 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging-Disclosures and Fair Value Measurements	6) Derivatives and Hedging—Disclosures and Fair Value Measurements The Company uses derivative instruments such as futures, options and swap agreements in order to mitigate exposure to market risk associated with the purchase of home heating oil for price-protected customers, physical inventory on hand, inventory in transit, priced purchase commitments and internal fuel usage. FASB ASC 815-10-05 Derivatives and Hedging, established accounting and reporting standards requiring that derivative instruments be recorded at fair value and included in the consolidated balance sheet as assets or liabilities, along with qualitative disclosures regarding the derivative activity. The Company has elected not to designate its commodity derivative instruments as hedging derivatives, but rather as economic hedges whose change in fair value is recognized in its statement of operations in the caption “(Increase) decrease in the fair value of derivative instruments.” Depending on the risk being economically hedged, realized gains and losses are recorded in cost of product, cost of installations and services, or delivery and branch expenses. As of December 31, 2022, to hedge a substantial majority of the purchase price associated with heating oil gallons anticipated to be sold to its price-protected customers, the Company held the following derivative instruments that settle in future months to match anticipated sales: 9.4 million gallons of swap contracts, 23.2 million gallons of call options, 4.3 million gallons of put options, and 61.3 million net gallons of synthetic call options. To hedge its physical inventory on hand, inventory in transit and basis risk, the Company, as of December 31, 2022, held 25.3 million gallons of swap contracts and 7.3 million gallons of short future contracts that settle in future months. To hedge its internal fuel usage and other activities for fiscal 2023, the Company held 3.7 million gallons of swap contracts that settle in future months. As of December 31, 2021, to hedge a substantial majority of the purchase price associated with heating oil gallons anticipated to be sold to its price-protected customers, the Company held the following derivative instruments that settle in future months to match anticipated sales: 14.8 million gallons of swap contracts, 34.6 million gallons of call options, 4.5 million gallons of put options, and 52.6 million net gallons of synthetic call options. To hedge the inter-month differentials for its price-protected customers, its physical inventory on hand and inventory in transit, the Company, as of December 31, 2021, held 1.1 million gallons of long future contracts and 26.7 million gallons of short future contracts that settle in future months. To hedge its internal fuel usage and other activities for fiscal 2022, the Company held 5.0 million gallons of call options and swap contracts that settle in future months. As of December 31, 2022, the Company has interest rate swap agreements in order to mitigate exposure to market risk associated with variable rate interest on $ 86.9 million, or 53 %, of its long term debt. The Company has designated its interest rate swap agreements as cash flow hedging derivatives. To the extent these derivative instruments are effective and the accounting standard’s documentation requirements have been met, changes in fair value are recognized in other comprehensive income (loss) until the underlying hedged item is recognized in earnings. As of December 31, 2022 the fair value of the swap contracts was $ 1.7 million. As of September 30, 2022, the notional value of the swap contracts was $ 54.0 million and the fair value of the swap contracts was $ 2.0 million. We utilized Level 2 inputs in the fair value hierarchy of valuation techniques to determine the fair value of the swap contracts. The Company’s derivative instruments are with the following counterparties: Bank of America, N.A., Bank of Montreal, Cargill, Inc., Citibank, N.A., JPMorgan Chase Bank, N.A., Key Bank, N.A., Toronto-Dominion Bank and Wells Fargo Bank, N.A. The Company assesses counterparty credit risk and considers it to be low. We maintain master netting arrangements that allow for the non-conditional offsetting of amounts receivable and payable with counterparties to help manage our risks and record derivative positions on a net basis. The Company generally does not receive cash collateral from its counterparties and does not restrict the use of cash collateral it maintains at counterparties. At December 31, 2022, the aggregate cash posted as collateral in the normal course of business at counterparties was $ 2.2 million and recorded in “Prepaid expense and other current assets.” Positions with counterparties who are also parties to our credit agreement are collateralized under that facility. As of December 31, 2022, $ 3.3 hedge positions or payable amounts were secured under the credit facility. The Company’s Level 1 derivative assets and liabilities represent the fair value of commodity contracts used in its hedging activities that are identical and traded in active markets. The Company’s Level 2 derivative assets and liabilities represent the fair value of commodity and interest rate contracts used in its hedging activities that are valued using either directly or indirectly observable inputs, whose nature, risk and class are similar. No significant transfers of assets or liabilities have been made into and out of the Level 1 or Level 2 tiers. All derivative instruments were non-trading positions and were either a Level 1 or Level 2 instrument. The Company had no Level 3 derivative instruments. The fair market value of our Level 1 and Level 2 derivative assets and liabilities are calculated by our counter-parties and are independently validated by the Company. The Company’s calculations are, for Level 1 derivative assets and liabilities, based on the published New York Mercantile Exchange (“NYMEX”) market prices for the commodity contracts open at the end of the period. For Level 2 derivative assets and liabilities the calculations performed by the Company are based on a combination of the NYMEX published market prices and other inputs, including such factors as present value, volatility and duration. The Company had no assets or liabilities that are measured at fair value on a nonrecurring basis subsequent to their initial recognition. The Company’s commodity financial assets and liabilities measured at fair value on a recurring basis are listed on the following table. (In thousands) Fair Value Measurements at Reporting Date Using: Derivatives Not Designated Quoted Prices in Significant Other Under FASB ASC 815-10 Balance Sheet Location Total Level 1 Level 2 Asset Derivatives at December 31, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ 38,077 $ — $ 38,077 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net 1,225 — 1,225 Commodity contract assets at December 31, 2022 $ 39,302 $ — $ 39,302 Liability Derivatives at December 31, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ ( 39,893 ) $ — $ ( 39,893 ) Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net ( 654 ) — ( 654 ) Commodity contract liabilities at December 31, 2022 $ ( 40,547 ) $ — $ ( 40,547 ) Asset Derivatives at September 30, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ 51,134 $ — $ 51,134 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net 2,094 — 2,094 Commodity contract assets September 30, 2022 $ 53,228 $ — $ 53,228 Liability Derivatives at September 30, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ ( 34,494 ) $ — $ ( 34,494 ) Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net ( 743 ) — ( 743 ) Commodity contract liabilities September 30, 2022 $ ( 35,237 ) $ — $ ( 35,237 ) The Company’s commodity derivative assets (liabilities) offset by counterparty and subject to an enforceable master netting arrangement are listed on the following table. (In thousands) Gross Amounts Not Offset in the Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) Gross Gross Net Assets (Liabilities) Presented in the Statement of Financial Position Financial Cash Net Fair asset value of derivative instruments $ 17,871 $ ( 14,967 ) $ 2,904 $ — $ — $ 2,904 Long-term derivative assets included in 1,225 ( 654 ) 571 — — 571 Fair liability value of derivative instruments 20,206 ( 24,926 ) ( 4,720 ) — — ( 4,720 ) Total at December 31, 2022 $ 39,302 $ ( 40,547 ) $ ( 1,245 ) $ — $ — $ ( 1,245 ) Fair asset value of derivative instruments $ 47,784 $ ( 30,961 ) $ 16,823 $ — $ — $ 16,823 Long-term derivative assets included in deferred charges and other assets, net 2,094 ( 743 ) 1,351 — — 1,351 Fair liability value of derivative instruments 3,350 ( 3,533 ) ( 183 ) — — ( 183 ) Total at September 30, 2022 $ 53,228 $ ( 35,237 ) $ 17,991 $ — $ — $ 17,991 (In thousands) The Effect of Derivative Instruments on the Statement of Operations Amount of (Gain) or Loss Recognized Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 Location of (Gain) or Loss Three Months Ended December 31, Three Months Ended December 31, Commodity contracts Cost of product (a) $ ( 8,942 ) $ ( 9,975 ) Commodity contracts Cost of installations and service (a) $ 40 $ ( 127 ) Commodity contracts Delivery and branch expenses (a) $ ( 200 ) $ ( 284 ) Commodity contracts (Increase) / decrease in the fair $ 17,636 $ 13,403 (a) Represents realized closed positions and includes the cost of options as they expire. (b) Represents the change in value of unrealized open positions and expired options.

Inventories

Inventories	3 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories	7) Inventories The Company’s product inventories are stated at the lower of cost and net realizable value computed on the weighted average cost method. All other inventories, representing parts and equipment are stated at the lower of cost and net realizable value using the FIFO method. The components of inventory were as follows (in thousands): December 31, September 30, Product $ 87,348 $ 58,727 Parts and equipment 24,710 24,830 Total inventory $ 112,058 $ 83,557

Property and Equipment

Property and Equipment	3 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment	8) Property and Equipment Property and equipment are stated at cost. Depreciation is computed over the estimated useful lives of the depreciable assets using the straight-line method (in thousands): December 31, September 30, Property and equipment $ 245,573 $ 246,919 Less: accumulated depreciation 138,901 139,175 Property and equipment, net $ 106,672 $ 107,744

Business Combinations and Dives

Business Combinations and Divestitures	3 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Business Combinations and Divestitures	9) Business Combinations and Divestitures During fiscal year 2023 the Company has acquired two heating oil dealers for an aggregate purchase price of approximately $ 1.2 million (using $ 1.2 million in cash). The gross purchase price was allocated $ 1.7 million to intangible assets, $ 0.2 million to goodwill, $ 0.2 million to fixed assets and reduced by $ 0.9 million of negative working capital. The acquired companies’ operating results are included in the Company’s consolidated financial statements starting on their respective acquisition date, and are not material to the Company’s financial condition, results of operations, or cash flows. On October 25, 2022, the Company sold certain assets for cash proceeds of $ 2.2 million. During the first quarter of fiscal 2022, the Company acquired three heating oil dealers for an aggregate purchase price of approximately $ 4.2 million (using $ 3.3 million in cash and assuming $ 0.9 million of liabilities). The gross purchase price was allocated $ 2.9 million to intangible assets, $ 2.1 million to fixed assets and reduced by $ 0.8 million of negative working capital.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net	3 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, net	10) Goodwill and Intangible Assets, net Goodwill A summary of changes in Company’s goodwill is as follows (in thousands): Balance as of September 30, 2022 $ 254,110 Fiscal year 2023 business combinations 244 Balance as of December 31, 2022 $ 254,354 Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands): December 31, 2022 September 30, 2022 Gross Gross Carrying Accum. Carrying Accum. Amount Amortization Net Amount Amortization Net Customer lists $ 409,679 $ 347,351 $ 62,328 $ 409,980 $ 345,237 $ 64,743 Trade names and other intangibles 41,515 22,071 19,444 41,736 21,969 19,767 Total $ 451,194 $ 369,422 $ 81,772 $ 451,716 $ 367,206 $ 84,510 Amortization expense for intangible assets was $ 4.3 million for the three months ended December 31, 2022, compared to $ 4.8 million for the three months ended December 31, 2021.

Long-Term Debt and Bank Facilit

Long-Term Debt and Bank Facility Borrowings	3 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Long-Term Debt and Bank Facility Borrowings	11) Long-Term Debt and Bank Facility Borrowings The Company’s debt is as follows (in thousands): December 31, September 30, 2022 2022 Carrying Fair Value (a) Carrying Fair Value (a) Revolving Credit Facility Borrowings $ 136,574 $ 136,574 $ 20,276 $ 20,276 Senior Secured Term Loan (b) 160,022 160,875 164,084 165,000 Total debt $ 296,596 $ 297,449 $ 184,360 $ 185,276 Total short-term portion of debt $ 153,074 $ 153,074 $ 32,651 $ 32,651 Total long-term portion of debt (b) $ 143,522 $ 144,375 $ 151,709 $ 152,625 (a) The face amount of the Company’s variable rate long-term debt approximates fair value. (b) Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022 . On July 6, 2022, the Company refinanced its five-year term loan and the revolving credit facility with the execution of the sixth amended and restated revolving credit facility agreement (the “credit agreement”) with a bank syndicate comprised of ten participants, which enables the Company to borrow up to $ 400 million ($ 550 million during the heating season of December through April of each year) on a revolving credit facility for working capital purposes (subject to certain borrowing base limitations and coverage ratios), provides for a $ 165 million five-year senior secured term loan (“Term Loan”), allows for the issuance of up to $ 25 million in letters of credit, and has a maturity date of July 6, 2027 . The Company can increase the revolving credit facility size by an additional $ 200 million without the consent of the bank group. However, the bank group is not obligated to fund the $ 200 million increase. If the bank group elects not to fund the increase, the Company can add additional lenders to the group, with the consent of the Agent (as defined in the credit agreement), which shall not be unreasonably withheld. Obligations under the credit agreement are guaranteed by the Company and its subsidiaries and are secured by liens on substantially all of the Company’s assets, including accounts receivable, inventory, general intangibles, real property, fixtures and equipment. All amounts outstanding under the sixth amended and restated revolving credit facility become due and payable on the facility termination date of July 6, 2027. The Term Loan is repayable in quarterly payments of $ 4.1 million, the first of which was made December 30, 2022, plus an annual payment equal to 25 % of the annual Excess Cash Flow as defined in the credit agreement (an amount not to exceed $ 8.5 million annually), less certain voluntary prepayments made during the year, with final payment at maturity. In fiscal 2022 the Company repaid $ 4.9 million of additional loan repayments due to Excess Cash Flow related to fiscal 2021. Under the Company’s sixth amended and restated revolving credit facility, the next annual Excess Cash Flow payment will be applicable for fiscal year ended September 30, 2023. The interest rate on the revolving credit facility and the term loan is based on a margin over Adjusted Term Secured Overnight Financing Rate ("SOFR") or a base rate. At December 31, 2022, the effective interest rate on the term loan and revolving credit facility borrowings was approximately 5.9 % and 6.5 %, respectively. At September 30, 2022, the effective interest rate on the term loan and revolving credit facility borrowings was approximately 4.7 % and 2.6 %, respectively. The commitment fee on the unused portion of the revolving credit facility is 0.30 % from December through April, and 0.20 % from May through November. The credit agreement requires the Company to meet certain financial covenants, including a fixed charge coverage ratio (as defined in the credit agreement) of not less than 1.1 as long as the Term Loan is outstanding or revolving credit facility availability is less than 12.5 % of the facility size. In addition, as long as the Term Loan is outstanding, a senior secured leverage ratio cannot be more than 3.0 as calculated as of the quarters ending June or September, and no more than 5.5 as calculated as of the quarters ending December or March. Certain restrictions are also imposed by the sixth amended and restated credit agreement, including restrictions on the Company’s ability to incur additional indebtedness, to pay distributions to unitholders, to pay certain inter-company dividends or distributions, repurchase units, make investments, grant liens, sell assets, make acquisitions and engage in certain other activities. At December 31, 2022, $ 160.9 million of the Term Loan was outstanding, $ 136.6 million amount was outstanding under the revolving credit facility, $ 3.3 million hedge positions were secured under the credit agreement, and $ 5.1 million of letters of credit were issued and outstanding. At September 30, 2022, $ 165.0 million of the term loan was outstanding, $ 20.3 million was outstanding under the revolving credit facility, we did no t have to provide collateral for our hedge positions under the credit agreement and $ 5.1 million of letters of credit were issued and outstanding. At December 31, 2022, availability was $ 188.5 million, and the Company was in compliance with the fixed charge coverage ratio and the senior secured leverage ratio. At September 30, 2022, availability was $ 189.4 million, and the Company was in compliance with the fixed charge coverage ratio and the senior secured leverage ratio.

Income Taxes

Income Taxes	3 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	12) Income Taxes The accompanying financial statements are reported on a fiscal year, however, the Company and its corporate subsidiaries file Federal and State income tax returns on a calendar year. The current and deferred income tax expense for the three months ended December 31, 2022 and December 31, 2021 are as follows: Three Months Ended December 31, (in thousands) 2022 2021 Income before income taxes $ 19,002 $ 20,327 Current income tax expense 6,687 6,522 Deferred income tax benefit ( 1,224 ) ( 684 ) Total income tax expense $ 5,463 $ 5,838 At December 31, 2022, we did no t have unrecognized income tax benefits. Our continuing practice is to recognize interest and penalties related to income tax matters as a component of income tax expense. We file U.S. Federal income tax returns and various state and local returns. A number of years may elapse before an uncertain tax position is audited and finally resolved. For our Federal income tax returns we have four tax years subject to examination. In our major state tax jurisdictions of New York, Connecticut and Pennsylvania, we have four years that are subject to examination. In the state tax jurisdiction of New Jersey we have five tax years that are subject to examination. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, based on our assessment of many factors, including past experience and interpretation of tax law, we believe that our provision for income taxes reflect the most probable outcome. This assessment relies on estimates and assumptions and may involve a series of complex judgments about future events.

Supplemental Disclosure of Cash

Supplemental Disclosure of Cash Flow Information	3 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	13) Supplemental Disclosure of Cash Flow Information Three Months Ended Cash paid during the period for: December 31, (in thousands) 2022 2021 Income taxes, net $ 5,479 $ 5,398 Interest $ 4,286 $ 2,037

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	14) Commitments and Contingencies The Company’s operations are subject to the operating hazards and risks normally incidental to handling, storing and transporting and otherwise providing for use by consumers hazardous liquids such as home heating oil and propane. In the ordinary course of business, the Company is a defendant in various legal proceedings and litigation. The Company records a liability when it is probable that a loss has been incurred and the amount is reasonably estimable. We do not believe these matters, when considered individually or in the aggregate, could reasonably be expected to have a material adverse effect on the Company’s results of operations, financial position or liquidity. The Company maintains insurance policies with insurers in amounts and with coverages and deductibles we believe are reasonable and prudent. However, the Company cannot assure that this insurance will be adequate to protect it from all material expenses related to current and potential future claims, legal proceedings and litigation, as certain types of claims may be excluded from our insurance coverage. If we incur substantial liability and the damages are not covered by insurance, or are in excess of policy limits, or if we incur liability at a time when we are not able to obtain liability insurance, then our business, results of operations and financial condition could be materially adversely affected.

Earnings Per Limited Partner Un

Earnings Per Limited Partner Unit	3 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Limited Partner Unit	15) Earnings Per Limited Partner Unit The following table presents the net income allocation and per unit data: Three Months Ended Basic and Diluted Earnings Per Limited Partner: December 31, (in thousands, except per unit data) 2022 2021 Net income $ 13,539 $ 14,489 Less General Partner’s interest in net income 122 122 Net income available to limited partners 13,417 14,367 Less dilutive impact of theoretical distribution of earnings * 1,723 1,883 Limited Partner’s interest in net income $ 11,694 $ 12,484 Per unit data: Basic and diluted net income available to limited partners $ 0.37 $ 0.37 Less dilutive impact of theoretical distribution of earnings * 0.04 0.05 Limited Partner’s interest in net income $ 0.33 $ 0.32 Weighted average number of Limited Partner units outstanding 35,916 38,789 In any accounting period where the Company’s aggregate net income exceeds its aggregate distribution for such period, the Company is required to present net income per Limited Partner unit as if all of the earnings for the period were distributed, based on the terms of the Partnership agreement, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Company’s overall net income or other financial results.

Subsequent Events

Subsequent Events	3 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	16) Subseq ue nt Events Quarterly Distribution Declared In January 2023, we declared a quarterly distribution of $ 0.1525 per unit, or $ 0.61 per unit on an annualized basis, on all Common Units with respect to the first quarter of fiscal 2023, paid on January 31, 2023 , to holders of record on January 23, 2023 . The amount of distributions in excess of the minimum quarterly distribution of $ 0.0675 are distributed in accordance with our Partnership Agreement, subject to the management incentive compensation plan. As a result, $ 5.4 million was paid to the Common Unit holders, $ 0.3 million to the General Partner unit holders (including $ 0.3 million of incentive distribution as provided in our Partnership Agreement) and $ 0.3 million to management pursuant to the management incentive compensation plan which provides for certain members of management to receive incentive distributions that would otherwise be payable to the General Partner.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements include the accounts of Star and its subsidiaries. All material intercompany items and transactions have been eliminated in consolidation. The financial information included herein is unaudited; however, such information reflects all adjustments (consisting solely of normal recurring adjustments), which are, in the opinion of management, necessary for the fair statement of financial condition and results for the interim periods. Due to the seasonal nature of the Company’s business, the results of operations and cash flows for the three-month period ended December 31, 2022 are not necessarily indicative of the results to be expected for the full year. These interim financial statements of the Company have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information and Rule 10-01 of Regulation S-X of the U.S. Securities and Exchange Commission (the “SEC”) and should be read in conjunction with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended September 30, 2022.
Comprehensive Income	Comprehensive Income Comprehensive income is comprised of Net income and Other comprehensive income. Other comprehensive income consists of the unrealized gain on amortization on the Company’s pension plan obligation for its two frozen defined benefit pension plans, unrealized gain (loss) on available-for-sale investments, unrealized gain (loss) on interest rate hedges and the corresponding tax effects.
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. At December 31, 2022, the $ 22.8 million of cash, cash equivalents, and restricted cash on the Condensed Consolidated Statements of Cash Flows is composed of $ 22.6 million of cash and cash equivalents and $ 0.3 million of restricted cash. At September 30, 2022, the $ 14.9 million of cash, cash equivalents, and restricted cash on the Condensed Consolidated Statements of Cash Flows is composed of $ 14.6 million of cash and cash equivalents and $ 0.3 million of restricted cash. Restricted cash represents deposits held by our captive insurance company that are required by state insurance regulations to remain in the captive insurance company as cash.
Assets Held for Sale	Assets Held for Sale Assets held for sale at September 30, 2022 represent certain heating oil assets that the Company sold on October 25, 2022. The carrying amount of the assets held for sale included $ 2.2 million of goodwill and $ 0.8 million of property and equipment, net. We measure and record assets held for sale at the lower of their carrying amount or fair value less cost to sell. The carrying amounts of the assets held for sale approximated their fair value at September 30, 2022.
Fair Value Valuation Approach	Fair Value Valuation Approach The Company uses valuation approaches that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. The Company determines fair value based on assumptions that market participants would use in pricing an asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: • Level 1 inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date. • Level 2 inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. • Level 3 inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date.
Captive Insurance Collateral	Captive Insurance Collateral The captive insurance collateral is held by our captive insurance company in an irrevocable trust as collateral for certain workers’ compensation and automobile liability claims. The collateral is required by a third party insurance carrier that insures per claim amounts above a set deductible. If we did not deposit cash into the trust, the third party carrier would require that we issue an equal amount of letters of credit, which would reduce our availability under the sixth amended and restated credit agreement. Due to the expected timing of claim payments, the nature of the collateral agreement with the carrier, and our captive insurance company’s source of other operating cash, the collateral is not expected to be used to pay obligations within the next twelve months. Unrealized gains and losses, net of related income taxes, are reported as accumulated other comprehensive income (loss), except for losses from impairments which are determined to be other-than-temporary. Realized gains and losses, and declines in value judged to be other-than-temporary on available-for-sale securities are included in the determination of net income and are included in Interest expense, net, at which time the average cost basis of these securities are adjusted to fair value.
Weather Hedge Contract	Weather Hedge Contract To partially mitigate the adverse effect of warm weather on cash flows, the Company has used weather hedge contracts for a number of years. Weather hedge contracts are recorded in accordance with the intrinsic value method defined by the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 815-45-15 Derivatives and Hedging, Weather Derivatives (EITF 99-2). The premium paid is included in the caption “Prepaid expenses and other current assets” in the accompanying balance sheets and amortized over the life of the contract, with the intrinsic value method applied at each interim period. The Company entered into weather hedge contracts for fiscal year 2023. The hedge period runs from November 1 through March 31, taken as a whole. The “Payment Thresholds,” or strikes, are set at various levels and are referenced against degree days for the prior ten year average. The maximum amount the Company can receive is $ 12.5 million per year. In addition, we are obligated to make an annual payment capped at $ 5.0 million if degree days exceed the Payment Threshold. The temperatures experienced during the hedge period through December 31, 2022 were colder than the strikes in the weather hedge contracts. As a result the Company recorded a payable at December 31, 2022 of $ 0.4 million that increased delivery and branch expenses by a corresponding amount, and a receivable of $ 2.2 million at December 31, 2021 that reduced delivery and branch expenses by a corresponding amount.
New England Teamsters and Trucking Industry Pension Fund ("the NETTI Fund") Liability	New England Teamsters and Trucking Industry Pension Fund (“the NETTI Fund”) Liability As of December 31, 2022, we had $ 0.3 million and $ 16.2 million balances included in the captions “Accrued expenses and other current liabilities” and “Other long-term liabilities,” on our Condensed Consolidated Balance Sheet representing the remaining balance of the NETTI Fund withdrawal liability. As of September 30, 2022, we had $ 0.3 million and $ 16.2 million balances reflected in these categories respectively. Based on the borrowing rates currently available to the Company for long-term financing of a similar maturity, the fair value of the NETTI Fund withdrawal liability as of December 31, 2022 and September 30, 2022 was $ 20.0 million and $ 20.2 million, respectively. We utilized Level 2 inputs in the fair value hierarchy of valuation techniques to determine the fair value of this liability.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In December 2022, the FASB issued ASU No. 2022-06, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The Company adopted the ASU effective December 31, 2022. The update extends the sunset of Topic 848 from December 31, 2022 to December 31, 2024. The guidance provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as interbank offered rates and LIBOR. The Company has $ 52.8 million of interest rate swap agreements at December 31, 2022 that are benchmarked against LIBOR, which the Company has designated as cash flow hedging derivatives. This guidance includes practical expedients for contract modifications due to reference rate reform. The Company has elected to adopt the practical expedient that the Company may change the contractual terms of the interest rate swap agreements that are expected to be affected by reference rate reform and not be required to de-designate the hedging relationships. The adoption did not have an impact on the Company’s consolidated financial statements and related disclosures.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In October 2021, the FASB issued ASU No. 2021-08, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires accounting for contract assets and liabilities from contracts with customers in a business combination to be accounted for in accordance with ASC No. 606. The standard is effective for fiscal years beginning after December 15, 2022. The Company has not determined the timing of adoption, but does not expect ASU 2021-08 to have a material impact on its consolidated financial statements and related disclosures.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue by Major Sources	The following disaggregates our revenue by major sources for the three months ended December 31, 2022 and December 31, 2021: Three Months (in thousands) 2022 2021 Petroleum Products: Home heating oil and propane $ 435,523 $ 305,723 Other petroleum products 134,406 105,542 Total petroleum products 569,929 411,265 Installations and Services: Equipment installations 32,789 33,069 Equipment maintenance service contracts 28,716 26,977 Billable call services 16,753 16,959 Total installations and services 78,258 77,005 Total Sales $ 648,187 $ 488,270
Summary of Changes in Allowance for Credit Losses	Changes in the allowance for credit losses are as follows: (in thousands) Credit Loss Allowance Balance at September 30, 2022 $ 7,755 Current period provision 1,046 Write-offs, net and other ( 401 ) Balance as of December 31, 2022 $ 8,400

Common Unit Repurchase and Re_2

Common Unit Repurchase and Retirement (Tables)	3 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Company's Repurchase Activities	The following table shows repurchases under the Repurchase Plan: (in thousands, except per unit amounts) Period Total Number of Average Price Total Number of Maximum Number Fiscal year 2012 to 2022 total 24,933 $ 8.82 20,045 1,557 October 2022 154 $ 8.45 154 1,403 November 2022 167 $ 8.71 167 1,236 December 2022 90 $ 9.45 90 1,146 First quarter fiscal year 2023 total 411 $ 8.77 411 1,146 January 2023 — $ — — 1,146 (b) (a) Amount includes repurchase costs. (b) Of the total available for repurchase, approximately 0.8 million units are available for repurchase in open market transactions and 0.3 million units are available for repurchase in privately-negotiated transactions, under the Repurchase Plan.

Captive Insurance Collateral (T

Captive Insurance Collateral (Tables)	3 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of Captive Insurance Collateral to be Available-for-sale Investments	The Company considers all of its captive insurance collateral to be Level 1 available-for-sale investments. Investments at December 31, 2022 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 573 $ — $ — $ 573 U.S. Government Sponsored Agencies 49,972 — ( 2,803 ) 47,169 Corporate Debt Securities 20,293 — ( 813 ) 19,480 Total $ 70,838 $ — $ ( 3,616 ) $ 67,222 Investments at September 30, 2022 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 1,838 $ — $ — $ 1,838 U.S. Government Sponsored Agencies 48,473 — ( 3,052 ) 45,421 Corporate Debt Securities 20,322 — ( 919 ) 19,403 Total $ 70,633 $ — $ ( 3,971 ) $ 66,662
Schedule of Maturities of Investments	Maturities of investments were as follows at December 31, 2022 (in thousands): Net Carrying Amount Due within one year $ 19,935 Due after one year through five years 47,287 Due after five years through ten years — Total $ 67,222

Derivatives and Hedging-Discl_2

Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables)	3 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The Company’s commodity financial assets and liabilities measured at fair value on a recurring basis are listed on the following table. (In thousands) Fair Value Measurements at Reporting Date Using: Derivatives Not Designated Quoted Prices in Significant Other Under FASB ASC 815-10 Balance Sheet Location Total Level 1 Level 2 Asset Derivatives at December 31, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ 38,077 $ — $ 38,077 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net 1,225 — 1,225 Commodity contract assets at December 31, 2022 $ 39,302 $ — $ 39,302 Liability Derivatives at December 31, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ ( 39,893 ) $ — $ ( 39,893 ) Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net ( 654 ) — ( 654 ) Commodity contract liabilities at December 31, 2022 $ ( 40,547 ) $ — $ ( 40,547 ) Asset Derivatives at September 30, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ 51,134 $ — $ 51,134 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net 2,094 — 2,094 Commodity contract assets September 30, 2022 $ 53,228 $ — $ 53,228 Liability Derivatives at September 30, 2022 Commodity contracts Fair asset and liability value of derivative instruments $ ( 34,494 ) $ — $ ( 34,494 ) Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net ( 743 ) — ( 743 ) Commodity contract liabilities September 30, 2022 $ ( 35,237 ) $ — $ ( 35,237 )
Company's Commodity Derivatives Assets (Liabilities) Offset by Counterparty	The Company’s commodity derivative assets (liabilities) offset by counterparty and subject to an enforceable master netting arrangement are listed on the following table. (In thousands) Gross Amounts Not Offset in the Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) Gross Gross Net Assets (Liabilities) Presented in the Statement of Financial Position Financial Cash Net Fair asset value of derivative instruments $ 17,871 $ ( 14,967 ) $ 2,904 $ — $ — $ 2,904 Long-term derivative assets included in 1,225 ( 654 ) 571 — — 571 Fair liability value of derivative instruments 20,206 ( 24,926 ) ( 4,720 ) — — ( 4,720 ) Total at December 31, 2022 $ 39,302 $ ( 40,547 ) $ ( 1,245 ) $ — $ — $ ( 1,245 ) Fair asset value of derivative instruments $ 47,784 $ ( 30,961 ) $ 16,823 $ — $ — $ 16,823 Long-term derivative assets included in deferred charges and other assets, net 2,094 ( 743 ) 1,351 — — 1,351 Fair liability value of derivative instruments 3,350 ( 3,533 ) ( 183 ) — — ( 183 ) Total at September 30, 2022 $ 53,228 $ ( 35,237 ) $ 17,991 $ — $ — $ 17,991
Company's Effect on Derivative Instruments on the Statement of Operations	(In thousands) The Effect of Derivative Instruments on the Statement of Operations Amount of (Gain) or Loss Recognized Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 Location of (Gain) or Loss Three Months Ended December 31, Three Months Ended December 31, Commodity contracts Cost of product (a) $ ( 8,942 ) $ ( 9,975 ) Commodity contracts Cost of installations and service (a) $ 40 $ ( 127 ) Commodity contracts Delivery and branch expenses (a) $ ( 200 ) $ ( 284 ) Commodity contracts (Increase) / decrease in the fair $ 17,636 $ 13,403 (a) Represents realized closed positions and includes the cost of options as they expire. (b) Represents the change in value of unrealized open positions and expired options.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Components of Inventory	The components of inventory were as follows (in thousands): December 31, September 30, Product $ 87,348 $ 58,727 Parts and equipment 24,710 24,830 Total inventory $ 112,058 $ 83,557

Property and Equipment (Tables)

Property and Equipment (Tables)	3 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment are stated at cost. Depreciation is computed over the estimated useful lives of the depreciable assets using the straight-line method (in thousands): December 31, September 30, Property and equipment $ 245,573 $ 246,919 Less: accumulated depreciation 138,901 139,175 Property and equipment, net $ 106,672 $ 107,744

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, net (Tables)	3 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Company's Goodwill	A summary of changes in Company’s goodwill is as follows (in thousands): Balance as of September 30, 2022 $ 254,110 Fiscal year 2023 business combinations 244 Balance as of December 31, 2022 $ 254,354
Intangible Assets Subject to Amortization	The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands): December 31, 2022 September 30, 2022 Gross Gross Carrying Accum. Carrying Accum. Amount Amortization Net Amount Amortization Net Customer lists $ 409,679 $ 347,351 $ 62,328 $ 409,980 $ 345,237 $ 64,743 Trade names and other intangibles 41,515 22,071 19,444 41,736 21,969 19,767 Total $ 451,194 $ 369,422 $ 81,772 $ 451,716 $ 367,206 $ 84,510

Long-Term Debt and Bank Facil_2

Long-Term Debt and Bank Facility Borrowings (Tables)	3 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Company's Debt	The Company’s debt is as follows (in thousands): December 31, September 30, 2022 2022 Carrying Fair Value (a) Carrying Fair Value (a) Revolving Credit Facility Borrowings $ 136,574 $ 136,574 $ 20,276 $ 20,276 Senior Secured Term Loan (b) 160,022 160,875 164,084 165,000 Total debt $ 296,596 $ 297,449 $ 184,360 $ 185,276 Total short-term portion of debt $ 153,074 $ 153,074 $ 32,651 $ 32,651 Total long-term portion of debt (b) $ 143,522 $ 144,375 $ 151,709 $ 152,625 (a) The face amount of the Company’s variable rate long-term debt approximates fair value. (b) Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022 .

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Current and Deferred Income Tax Expense	The current and deferred income tax expense for the three months ended December 31, 2022 and December 31, 2021 are as follows: Three Months Ended December 31, (in thousands) 2022 2021 Income before income taxes $ 19,002 $ 20,327 Current income tax expense 6,687 6,522 Deferred income tax benefit ( 1,224 ) ( 684 ) Total income tax expense $ 5,463 $ 5,838

Supplemental Disclosure of Ca_2

Supplemental Disclosure of Cash Flow Information (Tables)	3 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Disclosure of Cash Flow Information	Three Months Ended Cash paid during the period for: December 31, (in thousands) 2022 2021 Income taxes, net $ 5,479 $ 5,398 Interest $ 4,286 $ 2,037

Earnings Per Limited Partner _2

Earnings Per Limited Partner Unit (Tables)	3 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income Allocation and Per Unit Data	The following table presents the net income allocation and per unit data: Three Months Ended Basic and Diluted Earnings Per Limited Partner: December 31, (in thousands, except per unit data) 2022 2021 Net income $ 13,539 $ 14,489 Less General Partner’s interest in net income 122 122 Net income available to limited partners 13,417 14,367 Less dilutive impact of theoretical distribution of earnings * 1,723 1,883 Limited Partner’s interest in net income $ 11,694 $ 12,484 Per unit data: Basic and diluted net income available to limited partners $ 0.37 $ 0.37 Less dilutive impact of theoretical distribution of earnings * 0.04 0.05 Limited Partner’s interest in net income $ 0.33 $ 0.32 Weighted average number of Limited Partner units outstanding 35,916 38,789 In any accounting period where the Company’s aggregate net income exceeds its aggregate distribution for such period, the Company is required to present net income per Limited Partner unit as if all of the earnings for the period were distributed, based on the terms of the Partnership agreement, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Company’s overall net income or other financial results.

Organization - Additional Infor

Organization - Additional Information (Detail) shares in Thousands		3 Months Ended
	Dec. 04, 2019 USD ($)	Dec. 31, 2022 Customer Segment Contract shares	Sep. 30, 2022 shares	Jul. 06, 2022 USD ($)	Dec. 31, 2021 shares	Sep. 30, 2021 shares
Limited Partners' Capital Account [Line Items]
Number of reportable segments | Segment		1
Sixth Amendment
Limited Partners' Capital Account [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility | $	$ 400,000,000			$ 400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility | $	$ 550,000,000
Due date of debt	Jul. 06, 2027
Sixth Amendment | Term Loan
Limited Partners' Capital Account [Line Items]
Outstanding term loan | $	$ 165,000,000
Senior secured term loan maturity period	5 years
Petro Holdings, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of Star Acquisitions Inc.		100%
Number of residential and commercial home heating oil and propane customers served | Customer		421,000
Number of customers to whom only home heating oil, gasoline and diesel were sells on a delivery only basis | Customer		76,400
Number of service contracts for natural gas and other heating systems | Contract		20,000
Number of customers to whom sell gasoline and diesel fuel | Customer		26,900
Star Group L.P.
Limited Partners' Capital Account [Line Items]
Percentage of limited partner interest		99.10%
Percentage of general partner interest		0.90%
Star Acquisitions, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership		100%
Common Stock
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		35,681	36,092		37,942	39,046
General Partner
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares		326	326		326	326

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Significant Accounting Policies [Line Items]
Cash, cash equivalents, and restricted cash	$ 22,841,000	$ 21,489,000		$ 14,870,000	$ 5,017,000
Cash and cash equivalents	22,591,000			14,620,000
Restricted cash	250,000			250,000	$ 300,000
Accrued expenses and other current liabilities	120,152,000			125,561,000
Other long-term liabilities	14,780,000			14,766,000
Interest Rate Swap Agreements | Cash Flow Hedging Derivatives
Schedule Of Significant Accounting Policies [Line Items]
Cash flow hedging derivatives, amount	52,800,000
Propane Assets | Goodwill
Schedule Of Significant Accounting Policies [Line Items]
Assets held-for-sale				2,200,000
Propane Assets | Property and Equipment, Net
Schedule Of Significant Accounting Policies [Line Items]
Assets held-for-sale				800,000
New England Teamsters & Trucking Industry Pension Fund
Schedule Of Significant Accounting Policies [Line Items]
Accrued expenses and other current liabilities	300,000			300,000
Other long-term liabilities	16,200,000			16,200,000
New England Teamsters & Trucking Industry Pension Fund | Significant Other Observable Inputs Level 2
Schedule Of Significant Accounting Policies [Line Items]
Multiemployer plan discounted withdrawal liability	20,000,000			$ 20,200,000
Financial Products Corporation
Schedule Of Significant Accounting Policies [Line Items]
Delivery and branch expense increased (reduced) under weather hedge contract	$ 400,000	$ (2,200,000)
Scenario Forecast
Schedule Of Significant Accounting Policies [Line Items]
Derivative maximum payout			$ 5,000,000
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Cash equivalents, highly liquid investments maturity	3 months
Maximum | Scenario Forecast
Schedule Of Significant Accounting Policies [Line Items]
Derivative maximum receivable			$ 12,500,000

Revenue Recognition - Summary o

Revenue Recognition - Summary of Disaggregation of Revenue by Major Sources (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total sales	$ 648,187	$ 488,270
Home heating oil and propane
Disaggregation Of Revenue [Line Items]
Total sales	435,523	305,723
Other petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	134,406	105,542
Petroleum products
Disaggregation Of Revenue [Line Items]
Total sales	569,929	411,265
Equipment installations
Disaggregation Of Revenue [Line Items]
Total sales	32,789	33,069
Equipment maintenance service contracts
Disaggregation Of Revenue [Line Items]
Total sales	28,716	26,977
Billable call services
Disaggregation Of Revenue [Line Items]
Total sales	16,753	16,959
Installations and services
Disaggregation Of Revenue [Line Items]
Total sales	$ 78,258	$ 77,005

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Revenue Recognition [Line Items]
Contract costs, amortization period	5 years
Contract liabilities	$ 149.1		$ 152.1
Contract with customer liability, revenue recognized	$ 85.6	$ 73
Maximum
Revenue Recognition [Line Items]
Contract liabilities recognition service contract period	1 year
Delivery and Branch Expenses
Revenue Recognition [Line Items]
Amortization of deferred contract costs	$ 1	$ 1
Prepaid Expense and Other Current Assets
Revenue Recognition [Line Items]
Deferred contract costs,current	3.5		3.4
Deferred Charges and Other Assets, Net
Revenue Recognition [Line Items]
Deferred contract costs,non current	$ 6.4		$ 5.6

Revenue Recognition - Summary_2

Revenue Recognition - Summary of Changes in Allowance for Credit Losses (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Balance at September 30, 2022	$ 7,755
Current period provision	1,046
Write-offs, net and other	(401)
Balance as of December 31, 2022	$ 8,400

Common Unit Repurchase and Re_3

Common Unit Repurchase and Retirement - Additional Information (Detail) - USD ($) shares in Thousands			1 Months Ended			3 Months Ended	120 Months Ended	122 Months Ended
	Jan. 31, 2023	Jul. 06, 2022	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Dec. 31, 2022	Sep. 30, 2022	Aug. 31, 2022	Jul. 31, 2022	Dec. 04, 2019
Capital Unit [Line Items]
Company's common units authorized for repurchase								1,700	400
Sixth Amendment
Capital Unit [Line Items]
Availability required to repurchase common units		$ 60,000,000
Percentage of the maximum facility size on a historical proforma and forward-looking basis		15%
Non Seasonal maximum borrowing capacity under revolving credit facility		$ 400,000,000								$ 400,000,000
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units		115%
Repurchase Plan
Capital Unit [Line Items]
Company's common units repurchased and retired			90	167	154	411	24,933	19,900
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Company's common units repurchased and retired	0
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	300							300
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	800							1,400

Common Unit Repurchase and Re_4

Common Unit Repurchase and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands			1 Months Ended			3 Months Ended	120 Months Ended	122 Months Ended
		Jan. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Dec. 31, 2022	Sep. 30, 2022	Aug. 31, 2022
Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			90	167	154	411	24,933	19,900
Average Price Paid per Unit	[1]		$ 9.45	$ 8.71	$ 8.45	$ 8.77	$ 8.82
Maximum Number of Units that May Yet Be Purchased			1,146	1,236	1,403	1,146	1,557
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		0
Average Price Paid per Unit	[1]	$ 0
Maximum Number of Units that May Yet Be Purchased	[2]	1,146
Publicly Announced Plans or Programs As Part of Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			90	167	154	411	20,045
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		0
[1] Amount includes repurchase costs. Of the total available for repurchase, approximately 0.8 million units are available for repurchase in open market transactions and 0.3 million units are available for repurchase in privately-negotiated transactions, under the Repurchase Plan.

Common Unit Repurchase and Re_5

Common Unit Repurchase and Retirement - Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions	Jan. 31, 2023	Aug. 31, 2022	Jul. 31, 2022
Capital Unit [Line Items]
Company's common units authorized for repurchase		1.7	0.4
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	0.8	1.4
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	0.3	0.3

Captive Insurance Collateral -

Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 70,838	$ 70,633
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(3,616)	(3,971)
Fair Value	67,222	66,662
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	573	1,838
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	573	1,838
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	49,972	48,473
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(2,803)	(3,052)
Fair Value	47,169	45,421
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,293	20,322
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(813)	(919)
Fair Value	$ 19,480	$ 19,403

Captive Insurance Collateral _2

Captive Insurance Collateral - Schedule of Maturities of Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Due within one year	$ 19,935
Due after one year through five years	47,287
Due after five years through ten years	0
Total	$ 67,222	$ 66,662

Derivatives and Hedging-Discl_3

Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) gal in Millions	3 Months Ended
	Dec. 31, 2022 USD ($) gal	Dec. 31, 2021 gal	Sep. 30, 2022 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedging positions or payable amounts secured under credit facility | $	$ 3,300,000		$ 0
Prepaid expense and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregated cash posted as collateral in normal course of business | $	2,200,000
Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value | $	$ 86,900,000		54,000,000
Percentage of market risk exposure of long term debt	53%
Fair Value | $	$ 1,700,000		$ 2,000,000
Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	23.2	34.6
Call Option | Synthetic calls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	61.3	52.6
Put Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	4.3	4.5
Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	9.4	14.8
Swap Contracts Bought | Short
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	25.3
Future Contracts | Long
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume		1.1
Future Contracts | Short
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	7.3	26.7
Hedge its Internal Fuel Usage and Other Related Activities Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	3.7
Hedge its Internal Fuel Usage and Other Related Activities Call Options and Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume		5

Derivatives and Hedging-Discl_4

Derivatives and Hedging-Disclosures and Fair Value Measurements - Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 - Commodity Contract - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	$ 39,302	$ 53,228
Derivative Liabilities, commodity contracts	(40,547)	(35,237)
Fair asset and fair liability value of derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	38,077	51,134
Derivative Liabilities, commodity contracts	(39,893)	(34,494)
Deferred charges and other assets, net and other long-term liabilities, net balances
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	1,225	2,094
Derivative Liabilities, commodity contracts	(654)	(743)
Significant Other Observable Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	39,302	53,228
Derivative Liabilities, commodity contracts	(40,547)	(35,237)
Significant Other Observable Inputs Level 2 | Fair asset and fair liability value of derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	38,077	51,134
Derivative Liabilities, commodity contracts	(39,893)	(34,494)
Significant Other Observable Inputs Level 2 | Deferred charges and other assets, net and other long-term liabilities, net balances
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	1,225	2,094
Derivative Liabilities, commodity contracts	$ (654)	$ (743)

Derivatives and Hedging-Discl_5

Derivatives and Hedging-Disclosures and Fair Value Measurements - Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net Assets (Liabilities) Presented in the Statement of Financial Position	$ (4,720)	$ (183)
Subject to an enforceable master netting arrangement
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net Assets (Liabilities) Presented in the Statement of Financial Position	(4,720)	(183)
Gross Assets Recognized	39,302	53,228
Gross Liabilities Offset in the Statement of Financial Position	(40,547)	(35,237)
Net Assets (Liabilities) Presented in the Statement of Financial Position	(1,245)	17,991
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount	(1,245)	17,991
Subject to an enforceable master netting arrangement | Fair asset value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	17,871	47,784
Gross Liabilities Offset in the Statement of Financial Position	(14,967)	(30,961)
Net Assets (Liabilities) Presented in the Statement of Financial Position	$ 2,904	$ 16,823
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current	Derivative Asset, Current
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount	$ 2,904	$ 16,823
Subject to an enforceable master netting arrangement | Other long-term assets, net
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	1,225	2,094
Gross Liabilities Offset in the Statement of Financial Position	(654)	(743)
Net Assets (Liabilities) Presented in the Statement of Financial Position	$ 571	$ 1,351
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Derivative Asset, Current	Derivative Asset, Current
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount	$ 571	$ 1,351
Subject to an enforceable master netting arrangement | Fair liability value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	20,206	3,350
Gross Liabilities Offset in the Statement of Financial Position	(24,926)	(3,533)
Gross Amounts Not Offset in the Statement of Financial Position, Net Amount	$ (4,720)	$ (183)

Derivatives and Hedging-Discl_6

Derivatives and Hedging-Disclosures and Fair Value Measurements - Effect of Derivative Instruments on Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Unrealized, commodity contracts	[1]	$ 17,636	$ 13,403
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Cost of product
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Recognized, commodity contracts	[2]	$ (8,942)	$ (9,975)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost and expenses	Cost and expenses
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Cost of installations and service
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Recognized, commodity contracts	[2]	$ 40	$ (127)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost and expenses	Cost and expenses
Fair Value, Measurements, Recurring | Derivatives Not Designated as Hedging Instruments under FASB ASC 815-10 | Commodity Contract | Delivery and branch expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Recognized, commodity contracts	[2]	$ (200)	$ (284)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Delivery and branch expenses	Delivery and branch expenses
[1] Represents the change in value of unrealized open positions and expired options. Represents realized closed positions and includes the cost of options as they expire.

Inventories - Components of Inv

Inventories - Components of Inventory (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Inventory Disclosure [Abstract]
Product	$ 87,348	$ 58,727
Parts and equipment	24,710	24,830
Total inventory	$ 112,058	$ 83,557

Property and Equipment - Compon

Property and Equipment - Component of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Property and equipment	$ 245,573	$ 246,919
Less: accumulated depreciation	138,901	139,175
Property and equipment, net	$ 106,672	$ 107,744

Business Combinations and Div_2

Business Combinations and Divestitures - Additional Information (Detail) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 25, 2022 USD ($)	Dec. 31, 2021 USD ($) PartnershipUnit	Sep. 30, 2023 USD ($) PartnershipUnit	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 254,354	$ 254,110
Heating Oil Dealers
Business Acquisition [Line Items]
Number of businesses acquired | PartnershipUnit		3
Aggregate purchase price partnership acquired		$ 4,200
Cash and assuming		3,300
Liabilities		900
Aggregate purchase price allocation, intangible assets		2,900
Aggregate purchase price allocation, fixed assets		2,100
Gross purchase price increased (reduced) by working capital credits		$ (800)
Cash proceeds from sale of assets	$ 2,200
Heating Oil Dealers | Scenario Forecast
Business Acquisition [Line Items]
Number of businesses acquired | PartnershipUnit			2
Aggregate purchase price partnership acquired			$ 1,200
Cash and assuming			1,200
Aggregate purchase price allocation, intangible assets			1,700
Goodwill			200
Aggregate purchase price allocation, fixed assets			200
Gross purchase price increased (reduced) by working capital credits			$ (900)

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, net - Summary of Changes in Company's Goodwill (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Balance on beginning	$ 254,110
Fiscal year 2023 business combinations	244
Balance on ending	$ 254,354

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 451,194	$ 451,716
Accum. Amortization	369,422	367,206
Net	81,772	84,510
Customer Lists
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	409,679	409,980
Accum. Amortization	347,351	345,237
Net	62,328	64,743
Trade Names And Other Intangibles
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,515	41,736
Accum. Amortization	22,071	21,969
Net	$ 19,444	$ 19,767

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 4.3	$ 4.8

Long-Term Debt and Bank Facil_3

Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Sep. 30, 2022
Debt Instrument [Line Items]
Long-term debt, carrying Amount		$ 296,596	$ 184,360
Current maturities of long-term debt, carrying Amount		153,074	32,651
Long-term debt	[1]	143,522	151,709
Long-term debt, fair value	[2]	297,449	185,276
Current maturities of long-term debt, fair value	[2]	153,074	32,651
Long-term portion of debt, fair value	[1],[2]	144,375	152,625
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowings, carrying Amount		136,574	20,276
Credit facility borrowings, fair value	[2]	136,574	20,276
Term Loan
Debt Instrument [Line Items]
Long-term debt, carrying Amount	[1]	160,022	164,084
Long-term debt, fair value	[1],[2]	$ 160,875	$ 165,000
[1] Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022 The face amount of the Company’s variable rate long-term debt approximates fair value.

Long-Term Debt and Bank Facil_4

Long-Term Debt and Bank Facility Borrowings - Company's Debt (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Debt Instrument [Line Items]
Long term debt		$ 296,596		$ 184,360
Loan repayment		4,125	$ 7,871
Term Loan
Debt Instrument [Line Items]
Unamortized debt issuance costs		900		900
Long term debt	[1]	$ 160,022		$ 164,084
[1] Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022

Long-Term Debt and Bank Facil_5

Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)			3 Months Ended		12 Months Ended
		Jul. 06, 2022	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Debt Instrument [Line Items]
Term loan periodic payment			$ 8,500,000
Additional term loan repayments			4,125,000	$ 7,871,000
Hedging positions and payable amounts secured under credit facility			3,300,000		$ 0
Letters of credit issued and outstanding			5,100,000		5,100,000
Long-term debt, fair value	[1]		297,449,000		185,276,000
Revolving credit facility outstanding			136,574,000		20,276,000
Availability under credit agreement			$ 188,500,000		$ 189,400,000
Term Loan
Debt Instrument [Line Items]
Debt instrument, effective interest rate			5.90%		4.70%
Long-term debt, fair value	[1],[2]		$ 160,875,000		$ 165,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, effective interest rate			6.50%		2.60%
Revolving credit facility outstanding			$ 136,600,000		$ 20,300,000
Credit Agreement
Debt Instrument [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility		$ 400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility		550,000,000
Issuance of line of credit for working capital purposes		$ 25,000,000
Senior secured term loan maturity date		Jul. 06, 2027
Facility size that can be increased additional without consulting bank group			200,000,000
Facility size that can be increased without consulting bank group			$ 200,000,000
Term loan annual payment percentage		25%
Additional term loan repayments					$ 4,900,000
Commitment fee on the unused portion of the facility from December through April		0.30%
Commitment fee on the unused portion of the facility from May through November		0.20%
Minimum fixed charge coverage ratio		110%
Availability percentage to maximum facility size		12.50%
Credit Agreement | Maximum
Debt Instrument [Line Items]
Senior secured leverage ratio during quarters ending June or September		300%
Senior secured leverage ratio during quarters ending December or March		550%
Credit Agreement | Quarterly
Debt Instrument [Line Items]
Term loan periodic payment		$ 4,100,000
Credit Agreement | Term Loan
Debt Instrument [Line Items]
Outstanding term loan		$ 165,000,000
Senior secured term loan maturity period		5 years
[1] The face amount of the Company’s variable rate long-term debt approximates fair value. Carrying amounts are net of unamortized debt issuance costs of $ 0.9 million as of December 31, 2022 and $ 0.9 million as of September 30, 2022

Income Taxes - Current and Defe

Income Taxes - Current and Deferred Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 19,002	$ 20,327
Current income tax expense	6,687	6,522
Deferred income tax benefit	(1,224)	(684)
Total income tax expense	$ 5,463	$ 5,838

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	3 Months Ended
	Dec. 31, 2022 USD ($)
Income Tax Disclosure [Line Items]
Unrecognized income tax benefits	$ 0
Federal
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
New York
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
Connecticut
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
Pennsylvania
Income Tax Disclosure [Abstract]
Number of years for examination	4 years
New Jersey
Income Tax Disclosure [Abstract]
Number of years for examination	5 years

Supplemental Disclosure of Ca_3

Supplemental Disclosure of Cash Flow Information - Schedule of Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash paid during the period for:
Income taxes, net	$ 5,479	$ 5,398
Interest	$ 4,286	$ 2,037

Earnings Per Limited Partner _3

Earnings Per Limited Partner Unit - Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Basic and Diluted Earnings Per Limited Partner:
Net income		$ 13,539	$ 14,489
Less General Partner's interest in net income		122	122
Net income available to limited partners		13,417	14,367
Less dilutive impact of theoretical distribution of earnings	[1]	1,723	1,883
Limited Partner's interest in net income		$ 11,694	$ 12,484
Per unit data:
Basic and diluted net income available to limited partners		$ 0.37	$ 0.37
Less dilutive impact of theoretical distribution of earnings		(0.04)	0.05	[1]
Limited Partner's interest in net income		$ 0.33	$ 0.32
Weighted average number of Limited Partner units outstanding, Basic		35,916	38,789
Weighted average number of Limited Partner units outstanding, Diluted		35,916	38,789
[1] In any accounting period where the Company’s aggregate net income exceeds its aggregate distribution for such period, the Company is required to present net income per Limited Partner unit as if all of the earnings for the period were distributed, based on the terms of the Partnership agreement, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Company’s overall net income or other financial results.

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Dividend Declared $ / shares in Units, $ in Millions	Jan. 31, 2023 USD ($) $ / shares
Subsequent Event [Line Items]
Distribution declared | $ / shares	$ 0.1525
Partners capital projected distribution amount on annualized basis | $ / shares	0.61
Minimum dividend distribution per unit | $ / shares	$ 0.0675
Amount to paid to common unit holders	$ 5.4
Amount to paid to the General Partner	0.3
Incentive distribution to the General Partner	0.3
Incentive distributions to management	$ 0.3
Dividend paid date	Jan. 31, 2023
Dividend record date	Jan. 23, 2023