Star (SGU) 10-Q 1 May 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	SGU
Entity Registrant Name	STAR GROUP, L.P.
Entity Central Index Key	0001002590
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		50,080,375
Entity Small Business	false
Entity Emerging Growth Company	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2019	Sep. 30, 2018
Current assets
Cash and cash equivalents		$ 16,372	$ 14,531
Receivables, net of allowance of $9,804 and $8,002, respectively		286,997	132,668
Inventories		60,119	56,377
Fair asset value of derivative instruments			17,710
Prepaid expenses and other current assets		32,288	35,451
Total current assets		395,776	256,737
Property and equipment, net		89,346	87,618
Goodwill		239,294	228,436
Intangibles, net		89,489	98,444
Restricted cash		250	250
Captive insurance collateral	[1]	54,148	45,419
Deferred charges and other assets, net		18,539	13,067
Total assets		886,842	729,971
Current liabilities
Accounts payable		33,459	35,796
Revolving credit facility borrowings		115,000	1,500
Fair liability value of derivative instruments		1,518
Current maturities of long-term debt		10,000	7,500
Accrued expenses and other current liabilities		157,524	116,436
Unearned service contract revenue		63,718	60,700
Customer credit balances		22,781	61,256
Total current liabilities		404,000	283,188
Long-term debt		86,857	91,780
Deferred tax liabilities, net		15,872	21,206
Other long-term liabilities		24,692	24,012
Partners’ capital
Common unitholders		373,748	329,129
General partner		(1,146)	(1,303)
Accumulated other comprehensive loss, net of taxes		(17,181)	(18,041)
Total partners’ capital		355,421	309,785
Total liabilities and partners’ capital		$ 886,842	$ 729,971
[1]	See Note 2 – Significant Accounting Policies – Captive Insurance Collateral.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Statement Of Financial Position [Abstract]
Receivables, allowance	$ 9,804	$ 8,002

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Sales:
Total sales		$ 699,582	$ 684,031	$ 1,234,609	$ 1,120,865
Cost and expenses:
(Increase) decrease in the fair value of derivative instruments	[1]	(13,401)	11,609	17,638	209
Delivery and branch expenses		110,684	106,605	213,357	197,809
Depreciation and amortization expenses		7,858	7,703	15,603	15,444
General and administrative expenses		9,849	6,221	17,664	12,872
Finance charge income		(1,443)	(1,532)	(2,294)	(2,295)
Operating income		105,002	85,473	111,065	116,539
Interest expense, net		(3,194)	(2,383)	(5,710)	(4,470)
Amortization of debt issuance costs		(244)	(307)	(503)	(616)
Income before income taxes		101,564	82,783	104,852	111,453
Income tax expense		29,239	28,005	30,212	26,493
Net income		72,325	54,778	74,640	84,960
General Partner’s interest in net income		454	319	469	494
Limited Partners’ interest in net income		$ 71,871	$ 54,459	$ 74,171	$ 84,466
Basic and diluted income per Limited Partner Unit :	[2]	$ 1.15	$ 0.81	$ 1.19	$ 1.26
Weighted average number of Limited Partner units outstanding:
Basic and Diluted		51,427	55,642	52,174	55,766
Product
Sales:
Total sales		$ 637,400	$ 622,962	$ 1,096,107	$ 989,696
Installations and services
Sales:
Total sales		62,182	61,069	138,502	131,169
Cost of product
Cost and expenses:
Cost and expenses		415,639	403,293	721,865	646,073
Cost of installations and services
Cost and expenses:
Cost and expenses		$ 65,394	$ 64,659	$ 139,711	$ 134,214
[1]	Represents the change in value of unrealized open positions and expired options.
[2]	See Note 15 - Earnings Per Limited Partner Unit.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 72,325	$ 54,778	$ 74,640	$ 84,960
Other comprehensive income:
Unrealized gain on pension plan obligation	[1]	457	448	911	896
Tax effect of unrealized gain on pension plan obligation		(125)	(167)	(249)	(302)
Unrealized gain (loss) on captive insurance collateral		905	(931)	1,294	(931)
Tax effect of unrealized gain (loss) on captive insurance collateral		(194)	196	(276)	196
Unrealized loss on interest rate hedges		(367)		(1,112)
Tax effect of unrealized loss on interest rate hedges		95		292
Total other comprehensive income (loss)		771	(454)	860	(141)
Total comprehensive income		$ 73,096	$ 54,324	$ 75,500	$ 84,819
[1]	This item is included in the computation of net periodic pension cost.

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, 2017		$ 306,068		$ (929)	$ 325,762	$ (18,765)
Beginning Balance, unit at Sep. 30, 2017				326	55,888
Net income		30,182		$ 175	$ 30,007
Unrealized gain on pension plan obligation		448				448
Tax effect of unrealized gain on pension plan		(135)				(135)
Distributions		(6,302)		(154)	(6,148)
Ending Balance at Dec. 31, 2017		330,261		$ (908)	$ 349,621	(18,452)
Ending Balance, Unit at Dec. 31, 2017				326	55,888
Beginning Balance at Sep. 30, 2017		306,068		$ (929)	$ 325,762	(18,765)
Beginning Balance, unit at Sep. 30, 2017				326	55,888
Net income		84,960
Unrealized gain on pension plan obligation	[1]	896
Tax effect of unrealized gain on pension plan		(302)
Unrealized gain (loss) on captive insurance collateral		(931)
Tax effect of unrealized gain (loss) on captive insurance collateral		196
Ending Balance at Mar. 31, 2018		366,260		$ (743)	$ 385,909	(18,906)
Ending Balance, Unit at Mar. 31, 2018				326	54,607
Beginning Balance at Dec. 31, 2017		330,261		$ (908)	$ 349,621	(18,452)
Beginning Balance, unit at Dec. 31, 2017				326	55,888
Net income		54,778		$ 319	$ 54,459
Unrealized gain on pension plan obligation		448	[1]			448
Tax effect of unrealized gain on pension plan		(167)				(167)
Unrealized gain (loss) on captive insurance collateral		(931)				(931)
Tax effect of unrealized gain (loss) on captive insurance collateral		196				196
Distributions		(6,302)		(154)	(6,148)
Retirement of units	[2]	(12,023)			$ (12,023)
Retirement of units, shares	[2]				(1,281)
Ending Balance at Mar. 31, 2018		366,260		$ (743)	$ 385,909	(18,906)
Ending Balance, Unit at Mar. 31, 2018				326	54,607
Beginning Balance at Sep. 30, 2018		309,785		$ (1,303)	$ 329,129	(18,041)
Beginning Balance, unit at Sep. 30, 2018				326	53,088
Impact from adoption of ASU No. 2014-09		9,224		$ 60	$ 9,164
Net income		2,315		15	2,300
Unrealized gain on pension plan obligation		454				454
Tax effect of unrealized gain on pension plan		(124)				(124)
Unrealized gain (loss) on captive insurance collateral		389				389
Tax effect of unrealized gain (loss) on captive insurance collateral		(82)				(82)
Unrealized loss on interest rate hedges		(745)				(745)
Tax effect of unrealized loss on interest rate hedges		197				197
Distributions		(6,413)		(188)	(6,225)
Retirement of units	[2]	(5,735)			$ (5,735)
Retirement of units, shares	[2]				(599)
Ending Balance at Dec. 31, 2018		309,265		$ (1,416)	$ 328,633	(17,952)
Ending Balance, Unit at Dec. 31, 2018				326	52,489
Beginning Balance at Sep. 30, 2018		309,785		$ (1,303)	$ 329,129	(18,041)
Beginning Balance, unit at Sep. 30, 2018				326	53,088
Net income		74,640
Unrealized gain on pension plan obligation	[1]	911
Tax effect of unrealized gain on pension plan		(249)
Unrealized gain (loss) on captive insurance collateral		1,294
Tax effect of unrealized gain (loss) on captive insurance collateral		(276)
Unrealized loss on interest rate hedges		(1,112)
Tax effect of unrealized loss on interest rate hedges		292
Ending Balance at Mar. 31, 2019		355,421		$ (1,146)	$ 373,748	(17,181)
Ending Balance, Unit at Mar. 31, 2019				326	50,302
Beginning Balance at Dec. 31, 2018		309,265		$ (1,416)	$ 328,633	(17,952)
Beginning Balance, unit at Dec. 31, 2018				326	52,489
Net income		72,325		$ 454	$ 71,871
Unrealized gain on pension plan obligation		457	[1]			457
Tax effect of unrealized gain on pension plan		(125)				(125)
Unrealized gain (loss) on captive insurance collateral		905				905
Tax effect of unrealized gain (loss) on captive insurance collateral		(194)				(194)
Unrealized loss on interest rate hedges		(367)				(367)
Tax effect of unrealized loss on interest rate hedges		95				95
Distributions		(6,304)		(184)	(6,120)
Retirement of units	[2]	(20,636)			$ (20,636)
Retirement of units, shares	[2]				(2,187)
Ending Balance at Mar. 31, 2019		$ 355,421		$ (1,146)	$ 373,748	$ (17,181)
Ending Balance, Unit at Mar. 31, 2019				326	50,302
[1]	This item is included in the computation of net periodic pension cost.
[2]	See Note 4 – Common Unit Repurchase and Retirement.

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Cash flows provided by (used in) operating activities:
Net income		$ 74,640	$ 84,960
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	[1]	17,638	209
Depreciation and amortization		16,106	16,060
Provision for losses on accounts receivable		4,968	3,465
Change in deferred taxes		(9,335)	27,254
Changes in operating assets and liabilities:
Increase in receivables		(159,249)	(170,530)
Increase in inventories		(3,741)	(108)
(Increase) decrease in other assets		12,778	(4,486)
Increase (decrease) in accounts payable		(2,364)	8,118
Decrease in customer credit balances		(38,476)	(42,184)
Increase in other current and long-term liabilities		44,674	16,967
Net cash used in operating activities		(42,361)	(60,275)
Cash flows provided by (used in) investing activities:
Capital expenditures		(6,814)	(6,583)
Proceeds from sales of fixed assets		746	132
Purchase of investments	[2]	(7,571)	(34,542)
Acquisitions		(13,671)	(224)
Net cash used in investing activities		(27,310)	(41,217)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		139,331	160,104
Revolving credit facility repayments		(25,831)	(45,102)
Term loan repayments		(2,500)	(5,000)
Distributions		(12,717)	(12,604)
Unit repurchases		(26,371)	(12,023)
Customer retainage payments		(357)	(912)
Payments of debt issue costs		(43)
Net cash provided by financing activities		71,512	84,463
Net increase (decrease) in cash, cash equivalents, and restricted cash		1,841	(17,029)
Cash, cash equivalents, and restricted cash at beginning of period		14,781	52,708
Cash, cash equivalents, and restricted cash at end of period		$ 16,622	$ 35,679
[1]	Represents the change in value of unrealized open positions and expired options.
[2]	See Note 2 – Significant Accounting Policies – Captive Insurance Collateral.

Organization

Organization	6 Months Ended
	Mar. 31, 2019
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, and in certain of our marketing areas, we provide plumbing services primarily to our home heating oil and propane customer base. We believe we are the nation’s largest retail distributor of home heating oil based upon sales volume. Including our propane locations, we serve customers in the more northern and eastern states within the Northeast, Central and Southeast U.S. regions. The Company is organized as follows: • Star is a limited partnership, which at March 31, 2019, had outstanding 50.3 million Common Units (NYSE: “SGU”), representing a 99.4% limited partner interest in Star, and 0.3 million general partner units, representing a 0.6% 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”). Since November 1, 2017, Star elected to be treated as a corporation for Federal income tax purposes, so Star and its subsidiaries are subject to Federal and state corporate income taxes. • Star owns 100% of Star Acquisitions, Inc., a Minnesota corporation that owns 100% of Petro Holdings, Inc. (“Petro”). Star’s operations are conducted through Petro and its subsidiaries. At March 31, 2019 Petro served approximately 448,000 residential and commercial home heating oil and propane customers. Petro also sells diesel, gasoline and home heating oil to approximately 81,000 customers on a delivery only basis. We installed, maintained, and repaired heating and air conditioning equipment and to a lesser extent provided these services outside our heating oil and propane customer base including approximately 17,000 service contracts for natural gas and other heating systems. • Petroleum Heat and Power Co., Inc. (“PH&P”) is a 100% owned subsidiary of Star. PH&P is the borrower and Star is the guarantor of the fourth amended and restated credit agreement’s $100 million five-year senior secured term loan and the $300 million ($450 million during the heating season of December through April of each year) revolving credit facility, both due July 2, 2023. (See Note 11—Long-Term Debt and Bank Facility Borrowings)

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 2019
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 Group, L.P. 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 six month period ended March 31, 2019 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 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, 2018. Comprehensive Income Comprehensive income is comprised of Net income and Other comprehensive income (loss). Other comprehensive income (loss) consists of the unrealized gain 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 hedge 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 March 31, 2019, the $16.6 million of cash, cash equivalents, and restricted cash on the condensed consolidated statement of cash flows is composed of $16.4 million of cash and cash equivalents and $0.3 million of restricted cash. At September 30, 2018, the $14.8 million of cash, cash equivalents, and restricted cash on the condensed consolidated statements of cash flow is composed of $14.5 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. Captive Insurance Collateral At March 31, 2019, Captive insurance collateral is comprised of $52.7 million of Level 1 debt securities measured at fair value and $1.5 million of mutual funds measured at net asset value. At September 30, 2018, the balance was comprised of $44.8 million of Level 1 debt securities measured at fair value and $0.6 million of mutual funds measured at net asset value. Unrealized gains and losses, net of related income taxes, are reported as accumulated other comprehensive gain (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. The captive insurance collateral is held by our captive insurance company in an irrevocable trust as collateral for certain workers’ compensation, general and automobile liability claims. The collateral is required by a third party insurance carrier that insures per claim amounts above a set deductible. 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. 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 years 2018, 2019, 2020 and 2021. Under these contracts, we are entitled to receive a payment if the total number of degree days within the hedge period is less than the prior ten year average. The “Payment Thresholds,” or strikes, are set at various levels. In addition, we will be obligated to make a payment capped at $5.0 million if degree days exceed the prior ten year average. The hedge period runs from November 1 through March 31, taken as a whole, for each respective fiscal year. For fiscal 2019, 2020 and 2021 the maximum that the Company can receive annually is $12.5 million and the maximum that the Company would be obligated to pay annually is $5.0 million. As of March 31, 2019, the Company recorded a charge of $2.1 million under this contract that increased delivery and branch expenses. As of March 31, 2018, the Company recorded a charge of $1.9 million under its contract. The Company ultimately paid $2.1 million and $1.9 million in April 2019 and 2018, respectively. New England Teamsters and Trucking Industry Pension Fund (“the NETTI Fund”) Liability As of March 31, 2019, we had $0.2 million and $17.0 million balances included in the captions “Accrued expenses and other current liabilities” and “Other long-term liabilities,” respectively, on our condensed consolidated balance sheet representing the remaining balance of the NETTI Fund withdrawal liability. 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 March 31, 2019 was $21.3 million. 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 May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The FASB has also issued several updates to ASU No. 2014-09. The Company adopted ASU No. 2014-09 effective October 1, 2018 by using the modified retrospective method and recognized the cumulative effect of initially applying ASU No. 2014-09 as an adjustment to the opening balance of Partners’ Capital at October 1, 2018. The historical periods have not been adjusted and continue to be reported under ASC No. 605, Revenue Recognition. We have applied the guidance in ASU No. 2014-09 retrospectively to all contracts and have elected not to account for significant financing components if the period between revenue recognition and when the customer pays for product, service, or equipment installation will be one year or less. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flow (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The update addresses the issues of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The Company adopted ASU No. 2016-15 effective October 1, 2018. The adoption of ASU No. 2016-15 did not have an impact on the Company’s consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the definition of a business. The update clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2019, with early adoption permitted. The Company adopted ASU No. 2017-01 effective October 1, 2018. The adoption of ASU No. 2017-01 did not have an impact on the Company’s consolidated financial statements and related disclosures. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases. The update requires all leases with a term greater than twelve months to be recognized on the balance sheet by calculating the discounted present value of such leases and accounting for them through a right-of-use asset and an offsetting lease liability, and the disclosure of key information pertaining to leasing arrangements. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2020, with early adoption permitted. The Company does not intend to early adopt. The Company is continuing to evaluate the effect that ASU No. 2016-02 could have on its consolidated financial statements and related disclosures, but has not yet selected a transition method. The new guidance will materially change how we account for operating leases for office space, trucks and other equipment. Upon adoption, we expect to recognize discounted right-of-use assets and offsetting lease liabilities related to our operating leases of office space, trucks and other equipment. As of March 31, 2019, the undiscounted future minimum lease payments through 2033 for such operating leases are approximately $126.5 million, but the amount of leasing activity expected between March 31, 2019, and the date of adoption, is currently unknown. For this reason we are unable to estimate the discounted right-of-use assets and lease liabilities as of the date of adoption. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses. The update broadens the information that an entity should consider in developing expected credit loss estimates, eliminates the probable initial recognition threshold, and allows for the immediate recognition of the full amount of expected credit losses. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted in the first quarter of fiscal 2020. The Company is evaluating the effect that ASU No. 2016-13 will have on its consolidated financial statements and related disclosures, but has not yet determined the timing of adoption. In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 230): Simplifying the test for goodwill impairment. The update simplifies how an entity is required to test goodwill for impairment. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, but not exceed the total amount of goodwill allocated to the reporting unit. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted. The Company has not determined the timing of adoption, but does not expect ASU 2017-04 to have a material impact on its consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing and adding certain disclosures for these plans. The new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted. The Company is evaluating the effect that ASU No. 2018-14 will have on its consolidated financial statements and related disclosures, but has not determined the timing of adoption. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract, which will align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2022, with early adoption permitted. The Company is evaluating the effect that ASU No. 2018-15 will have on its consolidated financial statements and related disclosures, but has not determined the timing of adoption.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Mar. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue Recognition	3) Revenue Recognition Effective October 1, 2018 we adopted the requirements of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The adoption was not material to the financial statements presented. In accordance with the new revenue standard requirements, our condensed consolidated statement of operations and the consolidated balance sheet were impacted due to: i) the deferment of commissions provided to Company employees that were previously expensed as incurred, ii) the deferment of certain upfront credits For the Three Months Ended March 31, 2019 For the Six Months Ended March 31, 2019 Statement of Operations As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Sales: Product $ 637,400 $ 643,407 $ (6,007 ) $ 1,096,107 $ 1,105,560 $ (9,453 ) Installations and services 62,182 60,475 1,707 138,502 135,269 3,233 Total Sales 699,582 703,882 (4,300 ) 1,234,609 1,240,829 (6,220 ) Cost and Expenses: Delivery and branch expenses 110,684 111,163 (479 ) 213,357 216,372 (3,015 ) Operating income 105,002 108,823 (3,821 ) 111,065 114,270 (3,205 ) Income before income taxes 101,564 105,385 (3,821 ) 104,852 108,057 (3,205 ) Income tax expense 29,239 30,344 (1,105 ) 30,212 31,135 (923 ) Net income $ 72,325 $ 75,041 $ (2,716 ) $ 74,640 $ 76,922 $ (2,282 ) General Partner's interest in net income 454 470 (16 ) 469 483 (14 ) Limited Partner's interest in net income $ 71,871 $ 74,571 $ (2,700 ) $ 74,171 $ 76,439 $ (2,268 ) Basic and diluted income per Limited Partner Unit $ 1.15 $ 1.19 $ (0.04 ) $ 1.19 $ 1.22 $ (0.03 ) March 31, 2019 Balance Sheet As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Prepaid expenses and other current assets $ 32,288 $ 27,701 $ 4,587 Deferred charges and other assets, net $ 18,539 $ 11,962 $ 6,577 Liabilities Accrued expenses and other current liabilities $ 157,524 $ 158,447 $ (923 ) Unearned service contract revenue $ 63,718 $ 62,341 $ 1,377 Deferred tax liabilities, net $ 15,872 $ 12,104 $ 3,768 Partners' capital Common unitholders $ 373,748 $ 366,852 $ 6,896 General partner $ (1,146 ) $ (1,192 ) $ 46 The following disaggregates our revenue by major sources for the three and six months ended March 31, 2019 and March 31, 2018: Three Months Ended March 31, Six Months Ended March 31, (in thousands) 2019 2018 2019 2018 Petroleum Products: Home heating oil and propane $ 554,364 $ 554,782 $ 918,566 $ 856,250 Other petroleum products 83,036 68,180 177,541 133,446 Total petroleum products 637,400 622,962 1,096,107 989,696 Installations and Services: Equipment installations 20,384 19,697 50,367 47,041 Equipment maintenance service contracts 26,678 25,504 54,997 50,901 Billable call services 15,120 15,868 33,138 33,227 Total installations and services 62,182 61,069 138,502 131,169 Total Sales $ 699,582 $ 684,031 $ 1,234,609 $ 1,120,865 Performance Obligations Petroleum product revenues primarily consist of home heating oil and propane as well as diesel fuel and gasoline. Revenue from petroleum products are recognized at the time of delivery to the customer when control is passed from the Company to the customer. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring control of the petroleum products. Approximately 95% of our full service residential and commercial home heating oil customers automatically receive deliveries based on prevailing weather conditions. We offer several pricing alternatives to our residential home heating oil customers, including a variable price (market based) option and a price-protected option, the latter of which either sets the maximum price or a fixed price that a customer will pay. Equipment maintenance service contracts primarily cover heating, air conditioning, and natural gas equipment. We generally do not sell equipment maintenance service contracts to heating oil customers that do not take delivery of product from us. The service contract period of our equipment maintenance service contracts is generally one year or less. Revenues from equipment maintenance service contracts are recognized into income over the terms of the respective service contracts, on a straight-line basis. Our obligation to perform service is consistent through the duration of the contracts, and the straight-line basis of recognition is a faithful depiction of the transfer of our services. To the extent that the Company anticipates that future costs for fulfilling its contractual obligations under its equipment service contracts will exceed the amount of deferred revenue currently attributable to these contracts, the Company recognizes a loss in current period earnings equal to the amount that anticipated future costs exceed related deferred revenues. Revenue from billable call services (repairs, maintenance and other services including plumbing) and equipment installations (heating, air conditioning, and natural gas equipment) are recognized at the time that the work is performed. Our standard payment terms are generally 30 days. In addition, approximately 33% of our residential customers take advantage of our “smart pay” budget payment plan under which their estimated annual oil and propane deliveries and service contract billings are paid for in a series of equal monthly installments. Sales reported for product, installations and services exclude taxes assessed by various governmental authorities. Contract Costs We have elected to recognize incremental costs of obtaining a contract, other than new residential product and equipment maintenance service contracts, as an expense when incurred when the amortization period of the asset that we otherwise would have recognized is one year or less. 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 only defer these costs 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, or 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 March 31, 2019 the amount of deferred contract costs included in Prepaid expenses and other current assets and Deferred charges and other assets, net was $3.6 million and $6.6 million, respectively. We recognize an impairment charge to the extent the carrying amount of a deferred cost exceeds the remaining amount of consideration we expect to receive in exchange for the petroleum products and services related to the cost, less the expected costs related directly to providing those petroleum products and services that have not yet been recognized as expenses. There have been no impairment charges recognized for the six months ended March 31, 2019. Significant Judgments – Allocation of Transaction Price to Separate Performance Obligations Our contracts with customers often include distinct performance obligations to transfer products and perform equipment maintenance services to a customer that should be accounted for separately. Judgment is required to determine the stand-alone selling price for each distinct performance obligation. We determine the stand-alone selling price using information that may include market conditions and other observable inputs and typically have more than one stand-alone selling price for petroleum products and equipment maintenance services due to the stratification of those products and services by geography and customer characteristics. 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. Our “smart pay” budget payment plans are annual and generally begin outside of the heating season. We generally have received advanced amounts from customers on “smart pay” budget payment plans prior to the heating season, which are reduced as oil deliveries are made. For customers that are not on “smart pay” budget payment plans, we generally receive the full contract amount for equipment service contracts with customers at the outset of the contracts. Contract liabilities are recognized straight-line over the service contract period, generally one-year or less. As of March 31, 2019 and September 30, 2018 the Company had contract liabilities of $82.5 million and $118.6 million, respectively. During the six months ended March 31, 2019 the Company recognized $90.3 million of revenue that was included in the September 30, 2018 contract liability balance.

Common Unit Repurchase Plans an

Common Unit Repurchase Plans and Retirement	6 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Common Unit Repurchase Plans 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 that was amended in fiscal 2018 (the “Repurchase Plan”). Under the Repurchase Plan, as amended, the Board authorized the repurchase of 10.9 million Common Units, of which, 8.4 million were available for the Company to repurchase in open market transactions, and 2.5 million were available for repurchase in privately-negotiated transactions. As of the end of the second fiscal quarter of 2019, the Company repurchased approximately 7.1 million Common Units in open market and 1.2 million Common Units in privately-negotiated transactions under the Repurchase Plan. There is no guarantee of the exact number of units that will be purchased under the program and the Company may discontinue purchases at any time. The program 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 in the repurchase program will be retired. Under the Company’s fourth amended and restated credit agreement dated July 2, 2018, in order to repurchase Common Units we must maintain Availability (as defined in the amended and restated credit agreement) of $45 million, 15.0% of the facility size of $300 million (assuming the non-seasonal aggregate commitment is outstanding) 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. The Company was in compliance with this covenant as of March 31, 2019. The following table shows repurchases under the Repurchase Plan. (in thousands, except per unit amounts) Period Total Number of Units Purchased Average Price Paid per Unit (a) Total Number of Units Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Units that May Yet Be Purchased Fiscal year 2012 to 2018 total 7,937 $ 7.11 5,493 5,359 First quarter fiscal year 2019 total 599 $ 9.57 599 4,760 January 2019 516 $ 9.39 516 4,244 February 2019 (b) 1,474 $ 9.41 1,474 2,770 March 2019 197 $ 9.74 197 2,573 Second quarter fiscal year 2019 total 2,187 $ 9.44 2,187 2,573 April 2019 222 $ 9.67 222 2,351 (c) (a) Amount includes repurchase costs. (b) February 2019 common units repurchased include 1.2 million common units acquired in a private transaction. (c ) Of the total available for repurchase, approximately 1.1 million are available for repurchase in open market transactions and 1.3 million are available for repurchase in privately-negotiated transactions.

Captive Insurance Collateral

Captive Insurance Collateral	6 Months Ended
	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Captive Insurance Collateral	5) Captive Insurance Collateral The Company considers all of its Captive insurance collateral to be available-for-sale investments. Investments at March 31, 2019 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 376 $ — $ — $ 376 U.S. Government Sponsored Agencies 24,290 49 (2 ) 24,337 Corporate Debt Securities 25,298 76 (27 ) 25,347 Foreign Bonds and Notes 4,092 2 (6 ) 4,088 Total $ 54,056 $ 127 $ (35 ) $ 54,148 Investments at September 30, 2018 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 350 $ — $ — $ 350 U.S. Government Sponsored Agencies 10,735 — (192 ) 10,543 Corporate Debt Securities 30,427 — (928 ) 29,499 Foreign Bonds and Notes 5,111 — (84 ) 5,027 Total $ 46,623 $ — $ (1,204 ) $ 45,419 Maturities of investments were as follows at March 31, 2019 (in thousands): Net Carrying Amount Due within one year $ 5,333 Due after one year through five years 33,865 Due after five years through ten years 14,950 Total $ 54,148

Derivatives and Hedging-Disclos

Derivatives and Hedging-Disclosures and Fair Value Measurements	6 Months Ended
	Mar. 31, 2019
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 line item (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 March 31, 2019, 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: 7.2 million gallons of swap contracts, 2.2 million gallons of call options, 3.4 million gallons of put options, and 54.9 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 March 31, 2019, had 33.1 million gallons of long future contracts, and 50.8 million gallons of short future contracts that settle in future months. To hedge its internal fuel usage and other related activities for fiscal 2019, the Company, as of March 31, 2019, had 1.8 million gallons of swap contracts and 0.8 million gallons of short swap contracts that settle in future months. As of March 31, 2018, 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: 8.8 million gallons of swap contracts, 2.2 million gallons of call options, 4.2 million gallons of put options, and 53.3 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 March 31, 2018, had 34.4 million gallons of long future contracts, and 53.4 million gallons of short future contracts that settle in future months. To hedge its internal fuel usage and other related activities for fiscal 2018, the Company, as of March 31, 2018, had 1.1 million gallons of swap contracts that settle in future months. In August 2018, the Company entered into interest rate swap agreements in order to mitigate exposure to market risk associated with variable rate interest on $50.0 million, or 50%, 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 standard’s documentation requirements have been met, changes in fair value are recognized in other comprehensive income until the underlying hedged item is recognized in earnings. As of March 31, 2019, the fair value of the swap contracts was negative $1.1 million. As of September 30, 2018, the fair value of the swap contracts was $39 thousand. 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., Regions Financial Corporation, 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 March 31, 2019, the aggregate cash posted as collateral in the normal course of business at counterparties was $1.6 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 March 31, 2019, $3.5 million of hedge positions and payable amounts were secured under the credit facility. FASB ASC 820-10 Fair Value Measurements and Disclosures, established a three-tier fair value hierarchy, which classified the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. 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 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 as Hedging Instruments Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Under FASB ASC 815-10 Balance Sheet Location Total Level 1 Level 2 Asset Derivatives at March 31, 2019 Commodity contracts Fair liability value of derivative instruments $ 8,089 $ — $ 8,089 Commodity contracts Long-term derivative assets included in other long-term liabilities, net balance 972 — 972 Commodity contract assets at March 31, 2019 $ 9,061 $ — $ 9,061 Liability Derivatives at March 31, 2019 Commodity contracts Fair liability value of derivative instruments $ (9,607 ) $ — $ (9,607 ) Commodity contracts Long-term derivative assets included in other long-term liabilities, net balance (1,063 ) — (1,063 ) Commodity contract liabilities at March 31, 2019 $ (10,670 ) $ — $ (10,670 ) Asset Derivatives at September 30, 2018 Commodity contracts Fair asset value of derivative instruments $ 17,710 $ — $ 17,710 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net balance 906 — 906 Commodity contract assets September 30, 2018 $ 18,616 $ — $ 18,616 Liability Derivatives at September 30, 2018 Commodity contracts Fair liability and fair asset value of derivative instruments $ — $ — $ — Commodity contracts Long-term derivative liabilities included in the deferred charges and other assets, net balance (103 ) — (103 ) Commodity contract liabilities September 30, 2018 $ (103 ) $ — $ (103 ) The Company’s 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 Statement of Financial Position Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) Gross Assets Recognized Gross Liabilities Offset in the Statement of Financial Position Net Assets (Liabilities) Presented Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Fair asset value of derivative instruments $ — $ — $ — $ — $ — $ — Long-term derivative assets included in deferred charges and other assets, net — — — — — — Fair liability value of derivative instruments 8,089 (9,607 ) (1,518 ) — — (1,518 ) Long-term derivative liabilities included in other long-term liabilities, net 972 (1,063 ) (91 ) — — (91 ) Total at March 31, 2019 $ 9,061 $ (10,670 ) $ (1,609 ) $ — $ — $ (1,609 ) Fair asset value of derivative instruments $ 17,710 $ — $ 17,710 $ — $ — $ 17,710 Long-term derivative assets included in other long-term assets, net 906 (103 ) 803 — — 803 Fair liability value of derivative instruments — — — — — — Long-term derivative liabilities included in other long-term liabilities, net — — — — — — Total at September 30, 2018 $ 18,616 $ (103 ) $ 18,513 $ — $ — $ 18,513 (In thousands) The Effect of Derivative Instruments on the Statement of Operations Amount of (Gain) or Loss Recognized Amount of (Gain) or Loss Recognized Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 Location of (Gain) or Loss Recognized in Income on Derivative Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 Six Months Ended March 31, 2019 Six Months Ended March 31, 2018 Commodity contracts Cost of product (a) $ 14,345 $ (9,561 ) $ 8,193 $ (9,377 ) Commodity contracts Cost of installations and service (a) $ 403 $ 11 $ 650 $ (571 ) Commodity contracts Delivery and branch expenses (a) $ 271 $ (45 ) $ 437 $ (1,274 ) Commodity contracts (Increase) / decrease in the fair value of derivative instruments (b) $ (13,401 ) $ 11,609 $ 17,638 $ 209 (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	6 Months Ended
	Mar. 31, 2019
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): March 31, 2019 September 30, 2018 Product $ 38,130 $ 34,618 Parts and equipment 21,989 21,759 Total inventory $ 60,119 $ 56,377

Property and Equipment

Property and Equipment	6 Months Ended
	Mar. 31, 2019
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): March 31, 2019 September 30, 2018 Property and equipment $ 215,725 $ 210,581 Less: accumulated depreciation 126,379 122,963 Property and equipment, net $ 89,346 $ 87,618

Business Combinations

Business Combinations	6 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Combinations	9) Business Combinations During fiscal year 2019, the Company acquired a propane dealer and the assets of one of its subcontractors for an aggregate purchase price of approximately $ 13.7

Goodwill and Intangibles, net

Goodwill and Intangibles, net	6 Months Ended
	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles, net	10) Goodwill and Intangibles, net Goodwill A summary of changes in Company’s goodwill is as follows (in thousands): Balance as of September 30, 2018 $ 228,436 Fiscal year 2019 business combinations 10,858 Balance as of March 31, 2019 $ 239,294 Intangibles, net The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands): March 31, 2019 September 30, 2018 Gross Gross Carrying Accum. Carrying Accum. Amount Amortization Net Amount Amortization Net Customer lists $ 359,073 $ 288,214 $ 70,859 $ 358,776 $ 279,990 $ 78,786 Trade names and other intangibles 32,740 14,110 18,630 32,739 13,081 19,658 Total $ 391,813 $ 302,324 $ 89,489 $ 391,515 $ 293,071 $ 98,444 Amortization expense for intangible assets was $9.3 million for the six months ended March 31, 2019, compared to $9.6 million for the six months ended March 31, 2018.

Long-Term Debt and Bank Facilit

Long-Term Debt and Bank Facility Borrowings	6 Months Ended
	Mar. 31, 2019
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): March 31, September 30, 2019 2018 Carrying Amount Fair Value (a) Carrying Amount Fair Value (a) Revolving Credit Facility Borrowings $ 115,000 $ 115,000 $ 1,500 $ 1,500 Senior Secured Term Loan (b) 96,857 97,500 99,280 100,000 Total debt $ 211,857 $ 212,500 $ 100,780 $ 101,500 Total short-term portion of debt $ 125,000 $ 125,000 $ 9,000 $ 9,000 Total long-term portion of debt $ 86,857 $ 87,500 $ 91,780 $ 92,500 (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 $0.6 million as of March 31, 2019 and $0.7 million as of September 30, 2018. On July 2, 2018, the Company refinanced its five-year term loan and the revolving credit facility with the execution of the fourth amended and restated revolving credit facility agreement with a bank syndicate comprised of twelve participants, which enables the Company to borrow up to The Company can increase the revolving credit facility size by $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 fourth amended and restated credit facility 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 fourth amended and restated revolving credit facility become due and payable on the facility termination date of July 2, 2023. The Term Loan is repayable in quarterly payments of $2.5 million with the first payment made on January 2, 2019, plus an annual payment equal to 25% of the annual Excess Cash Flow as defined in the agreement (an amount not to exceed $15 million annually), less certain voluntary prepayments made during the year, with final payment at maturity . The interest rate on the fourth amended and restated revolving credit facility and the Term Loan is based on a margin over LIBOR or a base rate. At March 31, 2019, the effective interest rate on the Term Loan was approximately 5.7% and the effective interest rate on revolving credit facility borrowings was approximately 4.7%. At September 30, 2018, the effective interest rate on the term loan and revolving credit facility borrowings was approximately 5.2% and 3.8%, 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 fourth amended and restated 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 at any time cannot be more than 3.0 as calculated during the quarters ending June or September, and at any time no more than 4.5 as calculated during the quarters ending December or March. Certain restrictions are also imposed by the 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, make investments, grant liens, sell assets, make acquisitions and engage in certain other activities. At March 31, 2019, $97.5 million of the Term Loan was outstanding, $115.0 million was outstanding under the revolving credit facility, $3.5 million of hedge positions were secured under the credit agreement, and $7.1 million of letters of credit were issued and outstanding. At September 30, 2018, $100.0 million of the Term Loan was outstanding, $1.5 million was outstanding under the revolving credit facility, no hedge positions were secured under the credit agreement, and $7.1 million of letters of credit were issued and outstanding. At March 31, 2019, availability was $174.4 million, and the Company was in compliance with the fixed charge coverage ratio and the senior secured leverage ratio. At September 30, 2018, availability was $189.0 million, and the Company was in compliance with the fixed charge coverage ratio and the senior secured leverage ratio.

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2019
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 (benefit) for the three and six months ended March 31, 2019, and 2018 are as follows: Three Months Ended Six Months Ended March 31, March 31, (in thousands) 2019 2018 2019 2018 Income before income taxes $ 101,564 $ 82,783 $ 104,852 $ 111,453 Current tax expense (benefit) 37,958 (1,989 ) 39,547 (761 ) Deferred tax (benefit) expense (8,719 ) 29,778 (9,335 ) 38,490 Deferred tax (benefit) expense - impact of tax reform - 216 - (11,236 ) Total deferred tax (benefit) expense (8,719 ) 29,994 (9,335 ) 27,254 Total tax expense $ 29,239 $ 28,005 $ 30,212 $ 26,493 The effective income tax rate increased from 23.8% for the six months ended March 31, 2018 to 28.8% for the six months ended March 31, 2019 due primarily to a provisional $11.2 million discrete tax benefit recorded as of March 31, 2018 that was not recorded as of March 31, 2019. The discrete tax benefit resulted from the re-measurement of deferred tax liabilities as of March 31, 2018 due to the reduction of the Federal corporate income tax rate from 35% to 21% effective January 1, 2018 per the Tax Cuts and Jobs Act enacted in December 2017. The Company’s net deferred tax liabilities will be realized at a lower statutory tax rate than when originally recorded. Excluding the impact of the discrete tax benefit, our effective income tax rate decreased from 33.9% for the six months ended March 31, 2018 to 28.8% for the six months ended March 31, 2019 primarily due to the lower enacted Federal statutory tax rate. At March 31, 2019, we did not 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	6 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	13) Supplemental Disclosure of Cash Flow Information Six Months Ended Cash paid during the period for: March 31, (in thousands) 2019 2018 Income taxes, net $ 3,748 $ 479 Interest $ 5,770 $ 4,415

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	14) Commitments and Contingencies On April 18, 2017, a civil action was filed in the United States District Court for the Eastern District of New York, entitled M. Norman Donnenfeld v. Petro, Inc., Civil Action Number 2:17-cv-2310-JFB-SIL, against Petro, Inc. By amended complaint filed on August 15, 2017, the Plaintiff alleged he did not receive expected contractual benefits under his protected price plan contract when oil prices fell and asserts various claims for relief including breach of contract, violation of the New York General Business Law and fraudulent inducement. The Plaintiff also seeks to have a class certified of similarly situated Petro customers who entered into protected price plan contracts and were denied the same contractual benefits. No class has yet been certified in this action. The Plaintiff seeks compensatory, punitive and other damages in unspecified amounts. On September 15, 2017, Petro filed a motion to dismiss the amended complaint as time-barred and for failure to state a cause of action. On September 12, 2018, the district court granted in part and denied in part Petro's motion to dismiss. The district court dismissed the Plaintiff's claims for breach of the covenant of good faith and fair dealing and fraudulent inducement, but declined to dismiss the Plaintiff's remaining claims. The district court granted the Plaintiff leave to amend to attempt to replead his fraudulent inducement claim. On October 10, 2018, the Plaintiff filed a second amended complaint. The second amended complaint attempted to replead a fraudulent inducement claim and is otherwise substantially similar or identical to the prior complaint. On November 13, 2018, Petro moved to dismiss the fraudulent inducement and unjust enrichment claims in the second amended complaint. On January 31, 2019, the court granted the motion and dismissed the fraudulent inducement and unjust enrichment claims with prejudice. On February 22, 2019, counsel for Petro and the Plaintiff participated in a full-day mediation which, after arms-length negotiations, resulted in a memorandum of understanding to settle the litigation, subject to the completion of confirmatory discovery, negotiation of a final settlement agreement and court approval. In an order dated March 27, 2019, the district court stayed all discovery deadlines in light of the pending settlement. The anticipated settlement is not an admission of liability or breach to any customers by Petro and the Company continues to believe the allegations lack merit. If the settlement is not approved or finalized for any reason, the Company will continue to vigorously defend the action; in that case, we cannot assess the potential outcome or materiality of this matter. 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, including the above mentioned action, 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	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Limited Partner Unit	15) Earnings Per Limited Partner Unit Income per limited partner unit is computed in accordance with FASB ASC 260-10-05 Earnings Per Share, Master Limited Partnerships (EITF 03-06), by dividing the limited partners’ interest in net income by the weighted average number of limited partner units outstanding. The pro forma nature of the allocation required by this standard provides that 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 periods were distributed, 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. However, for periods in which the Company’s aggregate net income exceeds its aggregate distributions for such period, it will have the impact of reducing the earnings per limited partner unit, as the calculation according to this standard result in a theoretical increased allocation of undistributed earnings to the general partner. In accounting periods where aggregate net income does not exceed aggregate distributions for such period, this standard does not have any impact on the Company’s net income per limited partner unit calculation. A separate and independent calculation for each quarter and year-to-date period is performed, in which the Company’s contractual participation rights are taken into account. The following presents the net income allocation and per unit data using this method for the periods presented: Three Months Ended Six Months Ended Basic and Diluted Earnings Per Limited Partner: March 31, March 31, (in thousands, except per unit data) 2019 2018 2019 2018 Net income $ 72,325 $ 54,778 $ 74,640 $ 84,960 Less General Partner’s interest in net income 454 319 469 494 Net income available to limited partners 71,871 54,459 74,171 84,466 Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 12,934 9,444 12,294 14,423 Limited Partner’s interest in net income under FASB ASC 260-10-45-60 $ 58,937 $ 45,015 $ 61,877 $ 70,043 Per unit data: Basic and diluted net income available to limited partners $ 1.40 $ 0.98 $ 1.42 $ 1.51 Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 0.25 0.17 0.23 $ 0.25 Limited Partner’s interest in net income under FASB ASC 260-10-45-60 $ 1.15 $ 0.81 $ 1.19 $ 1.26 Weighted average number of Limited Partner units outstanding 51,427 55,642 52,174 55,766

Subsequent Events

Subsequent Events	6 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Quarterly Distribution Declared In April 2019, we declared a quarterly distribution of $0.125 per unit, or $0.50 per unit on an annualized basis, on all Common Units with respect to the second quarter of fiscal 2019, payable on May 6, 2019, to holders of record on April 26, 2019. 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, $6.3 million will be paid to the Common Unit holders, $0.23 million to the General Partner unit holders (including $0.20 million of incentive distribution as provided in our Partnership Agreement) and $0.2 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. Common Units Repurchased and Retired 0.2 9.67

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements include the accounts of Star Group, L.P. 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 six month period ended March 31, 2019 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 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, 2018.
Comprehensive Income	Comprehensive Income Comprehensive income is comprised of Net income and Other comprehensive income (loss). Other comprehensive income (loss) consists of the unrealized gain 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 hedge 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 March 31, 2019, the $16.6 million of cash, cash equivalents, and restricted cash on the condensed consolidated statement of cash flows is composed of $16.4 million of cash and cash equivalents and $0.3 million of restricted cash. At September 30, 2018, the $14.8 million of cash, cash equivalents, and restricted cash on the condensed consolidated statements of cash flow is composed of $14.5 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.
Captive Insurance Collateral	Captive Insurance Collateral At March 31, 2019, Captive insurance collateral is comprised of $52.7 million of Level 1 debt securities measured at fair value and $1.5 million of mutual funds measured at net asset value. At September 30, 2018, the balance was comprised of $44.8 million of Level 1 debt securities measured at fair value and $0.6 million of mutual funds measured at net asset value. Unrealized gains and losses, net of related income taxes, are reported as accumulated other comprehensive gain (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. The captive insurance collateral is held by our captive insurance company in an irrevocable trust as collateral for certain workers’ compensation, general and automobile liability claims. The collateral is required by a third party insurance carrier that insures per claim amounts above a set deductible. 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.
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 years 2018, 2019, 2020 and 2021. Under these contracts, we are entitled to receive a payment if the total number of degree days within the hedge period is less than the prior ten year average. The “Payment Thresholds,” or strikes, are set at various levels. In addition, we will be obligated to make a payment capped at $5.0 million if degree days exceed the prior ten year average. The hedge period runs from November 1 through March 31, taken as a whole, for each respective fiscal year. For fiscal 2019, 2020 and 2021 the maximum that the Company can receive annually is $12.5 million and the maximum that the Company would be obligated to pay annually is $5.0 million. As of March 31, 2019, the Company recorded a charge of $2.1 million under this contract that increased delivery and branch expenses. As of March 31, 2018, the Company recorded a charge of $1.9 million under its contract. The Company ultimately paid $2.1 million and $1.9 million in April 2019 and 2018, respectively.
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 March 31, 2019, we had $0.2 million and $17.0 million balances included in the captions “Accrued expenses and other current liabilities” and “Other long-term liabilities,” respectively, on our condensed consolidated balance sheet representing the remaining balance of the NETTI Fund withdrawal liability. 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 March 31, 2019 was $21.3 million. 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 May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The FASB has also issued several updates to ASU No. 2014-09. The Company adopted ASU No. 2014-09 effective October 1, 2018 by using the modified retrospective method and recognized the cumulative effect of initially applying ASU No. 2014-09 as an adjustment to the opening balance of Partners’ Capital at October 1, 2018. The historical periods have not been adjusted and continue to be reported under ASC No. 605, Revenue Recognition. We have applied the guidance in ASU No. 2014-09 retrospectively to all contracts and have elected not to account for significant financing components if the period between revenue recognition and when the customer pays for product, service, or equipment installation will be one year or less. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flow (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The update addresses the issues of debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. The Company adopted ASU No. 2016-15 effective October 1, 2018. The adoption of ASU No. 2016-15 did not have an impact on the Company’s consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the definition of a business. The update clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2019, with early adoption permitted. The Company adopted ASU No. 2017-01 effective October 1, 2018. The adoption of ASU No. 2017-01 did not have an impact on the Company’s consolidated financial statements and related disclosures.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases. The update requires all leases with a term greater than twelve months to be recognized on the balance sheet by calculating the discounted present value of such leases and accounting for them through a right-of-use asset and an offsetting lease liability, and the disclosure of key information pertaining to leasing arrangements. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2020, with early adoption permitted. The Company does not intend to early adopt. The Company is continuing to evaluate the effect that ASU No. 2016-02 could have on its consolidated financial statements and related disclosures, but has not yet selected a transition method. The new guidance will materially change how we account for operating leases for office space, trucks and other equipment. Upon adoption, we expect to recognize discounted right-of-use assets and offsetting lease liabilities related to our operating leases of office space, trucks and other equipment. As of March 31, 2019, the undiscounted future minimum lease payments through 2033 for such operating leases are approximately $126.5 million, but the amount of leasing activity expected between March 31, 2019, and the date of adoption, is currently unknown. For this reason we are unable to estimate the discounted right-of-use assets and lease liabilities as of the date of adoption. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses. The update broadens the information that an entity should consider in developing expected credit loss estimates, eliminates the probable initial recognition threshold, and allows for the immediate recognition of the full amount of expected credit losses. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted in the first quarter of fiscal 2020. The Company is evaluating the effect that ASU No. 2016-13 will have on its consolidated financial statements and related disclosures, but has not yet determined the timing of adoption. In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 230): Simplifying the test for goodwill impairment. The update simplifies how an entity is required to test goodwill for impairment. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, but not exceed the total amount of goodwill allocated to the reporting unit. This new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted. The Company has not determined the timing of adoption, but does not expect ASU 2017-04 to have a material impact on its consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing and adding certain disclosures for these plans. The new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2021, with early adoption permitted. The Company is evaluating the effect that ASU No. 2018-14 will have on its consolidated financial statements and related disclosures, but has not determined the timing of adoption. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract, which will align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new guidance is effective for our annual reporting period beginning in the first quarter of fiscal 2022, with early adoption permitted. The Company is evaluating the effect that ASU No. 2018-15 will have on its consolidated financial statements and related disclosures, but has not determined the timing of adoption.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Mar. 31, 2019
Summary of Disaggregation of Revenue by Major Sources	The following disaggregates our revenue by major sources for the three and six months ended March 31, 2019 and March 31, 2018: Three Months Ended March 31, Six Months Ended March 31, (in thousands) 2019 2018 2019 2018 Petroleum Products: Home heating oil and propane $ 554,364 $ 554,782 $ 918,566 $ 856,250 Other petroleum products 83,036 68,180 177,541 133,446 Total petroleum products 637,400 622,962 1,096,107 989,696 Installations and Services: Equipment installations 20,384 19,697 50,367 47,041 Equipment maintenance service contracts 26,678 25,504 54,997 50,901 Billable call services 15,120 15,868 33,138 33,227 Total installations and services 62,182 61,069 138,502 131,169 Total Sales $ 699,582 $ 684,031 $ 1,234,609 $ 1,120,865
ASU 2014-09
Summary of Impact of Adoption on Condensed Consolidated Statement of Operations and Balance Sheet	Effective October 1, 2018 we adopted the requirements of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The adoption was not material to the financial statements presented. In accordance with the new revenue standard requirements, our condensed consolidated statement of operations and the consolidated balance sheet were impacted due to: i) the deferment of commissions provided to Company employees that were previously expensed as incurred, ii) the deferment of certain upfront credits For the Three Months Ended March 31, 2019 For the Six Months Ended March 31, 2019 Statement of Operations As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Sales: Product $ 637,400 $ 643,407 $ (6,007 ) $ 1,096,107 $ 1,105,560 $ (9,453 ) Installations and services 62,182 60,475 1,707 138,502 135,269 3,233 Total Sales 699,582 703,882 (4,300 ) 1,234,609 1,240,829 (6,220 ) Cost and Expenses: Delivery and branch expenses 110,684 111,163 (479 ) 213,357 216,372 (3,015 ) Operating income 105,002 108,823 (3,821 ) 111,065 114,270 (3,205 ) Income before income taxes 101,564 105,385 (3,821 ) 104,852 108,057 (3,205 ) Income tax expense 29,239 30,344 (1,105 ) 30,212 31,135 (923 ) Net income $ 72,325 $ 75,041 $ (2,716 ) $ 74,640 $ 76,922 $ (2,282 ) General Partner's interest in net income 454 470 (16 ) 469 483 (14 ) Limited Partner's interest in net income $ 71,871 $ 74,571 $ (2,700 ) $ 74,171 $ 76,439 $ (2,268 ) Basic and diluted income per Limited Partner Unit $ 1.15 $ 1.19 $ (0.04 ) $ 1.19 $ 1.22 $ (0.03 ) March 31, 2019 Balance Sheet As Reported Balances without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Prepaid expenses and other current assets $ 32,288 $ 27,701 $ 4,587 Deferred charges and other assets, net $ 18,539 $ 11,962 $ 6,577 Liabilities Accrued expenses and other current liabilities $ 157,524 $ 158,447 $ (923 ) Unearned service contract revenue $ 63,718 $ 62,341 $ 1,377 Deferred tax liabilities, net $ 15,872 $ 12,104 $ 3,768 Partners' capital Common unitholders $ 373,748 $ 366,852 $ 6,896 General partner $ (1,146 ) $ (1,192 ) $ 46

Common Unit Repurchase Plans _2

Common Unit Repurchase Plans and Retirement (Tables)	6 Months Ended
	Mar. 31, 2019
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 Units Purchased Average Price Paid per Unit (a) Total Number of Units Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Units that May Yet Be Purchased Fiscal year 2012 to 2018 total 7,937 $ 7.11 5,493 5,359 First quarter fiscal year 2019 total 599 $ 9.57 599 4,760 January 2019 516 $ 9.39 516 4,244 February 2019 (b) 1,474 $ 9.41 1,474 2,770 March 2019 197 $ 9.74 197 2,573 Second quarter fiscal year 2019 total 2,187 $ 9.44 2,187 2,573 April 2019 222 $ 9.67 222 2,351 (c) (a) Amount includes repurchase costs. (b) February 2019 common units repurchased include 1.2 million common units acquired in a private transaction. (c ) Of the total available for repurchase, approximately 1.1 million are available for repurchase in open market transactions and 1.3 million are available for repurchase in privately-negotiated transactions.

Captive Insurance Collateral (T

Captive Insurance Collateral (Tables)	6 Months Ended
	Mar. 31, 2019
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 available-for-sale investments. Investments at March 31, 2019 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 376 $ — $ — $ 376 U.S. Government Sponsored Agencies 24,290 49 (2 ) 24,337 Corporate Debt Securities 25,298 76 (27 ) 25,347 Foreign Bonds and Notes 4,092 2 (6 ) 4,088 Total $ 54,056 $ 127 $ (35 ) $ 54,148 Investments at September 30, 2018 consist of the following (in thousands): Amortized Cost Gross Unrealized Gain Gross Unrealized (Loss) Fair Value Cash and Receivables $ 350 $ — $ — $ 350 U.S. Government Sponsored Agencies 10,735 — (192 ) 10,543 Corporate Debt Securities 30,427 — (928 ) 29,499 Foreign Bonds and Notes 5,111 — (84 ) 5,027 Total $ 46,623 $ — $ (1,204 ) $ 45,419
Schedule of Maturities of Investments	Maturities of investments were as follows at March 31, 2019 (in thousands): Net Carrying Amount Due within one year $ 5,333 Due after one year through five years 33,865 Due after five years through ten years 14,950 Total $ 54,148

Derivatives and Hedging-Discl_2

Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables)	6 Months Ended
	Mar. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The Company’s 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 as Hedging Instruments Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Under FASB ASC 815-10 Balance Sheet Location Total Level 1 Level 2 Asset Derivatives at March 31, 2019 Commodity contracts Fair liability value of derivative instruments $ 8,089 $ — $ 8,089 Commodity contracts Long-term derivative assets included in other long-term liabilities, net balance 972 — 972 Commodity contract assets at March 31, 2019 $ 9,061 $ — $ 9,061 Liability Derivatives at March 31, 2019 Commodity contracts Fair liability value of derivative instruments $ (9,607 ) $ — $ (9,607 ) Commodity contracts Long-term derivative assets included in other long-term liabilities, net balance (1,063 ) — (1,063 ) Commodity contract liabilities at March 31, 2019 $ (10,670 ) $ — $ (10,670 ) Asset Derivatives at September 30, 2018 Commodity contracts Fair asset value of derivative instruments $ 17,710 $ — $ 17,710 Commodity contracts Long-term derivative assets included in the deferred charges and other assets, net balance 906 — 906 Commodity contract assets September 30, 2018 $ 18,616 $ — $ 18,616 Liability Derivatives at September 30, 2018 Commodity contracts Fair liability and fair asset value of derivative instruments $ — $ — $ — Commodity contracts Long-term derivative liabilities included in the deferred charges and other assets, net balance (103 ) — (103 ) Commodity contract liabilities September 30, 2018 $ (103 ) $ — $ (103 )
Company's Derivatives Assets (Liabilities) Offset by Counterparty	The Company’s 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 Statement of Financial Position Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) Gross Assets Recognized Gross Liabilities Offset in the Statement of Financial Position Net Assets (Liabilities) Presented Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Fair asset value of derivative instruments $ — $ — $ — $ — $ — $ — Long-term derivative assets included in deferred charges and other assets, net — — — — — — Fair liability value of derivative instruments 8,089 (9,607 ) (1,518 ) — — (1,518 ) Long-term derivative liabilities included in other long-term liabilities, net 972 (1,063 ) (91 ) — — (91 ) Total at March 31, 2019 $ 9,061 $ (10,670 ) $ (1,609 ) $ — $ — $ (1,609 ) Fair asset value of derivative instruments $ 17,710 $ — $ 17,710 $ — $ — $ 17,710 Long-term derivative assets included in other long-term assets, net 906 (103 ) 803 — — 803 Fair liability value of derivative instruments — — — — — — Long-term derivative liabilities included in other long-term liabilities, net — — — — — — Total at September 30, 2018 $ 18,616 $ (103 ) $ 18,513 $ — $ — $ 18,513
Company's Derivatives Assets (Liabilities) Offset by Counterparty	The Company’s 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 Statement of Financial Position Offsetting of Financial Assets (Liabilities) and Derivative Assets (Liabilities) Gross Assets Recognized Gross Liabilities Offset in the Statement of Financial Position Net Assets (Liabilities) Presented Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Fair asset value of derivative instruments $ — $ — $ — $ — $ — $ — Long-term derivative assets included in deferred charges and other assets, net — — — — — — Fair liability value of derivative instruments 8,089 (9,607 ) (1,518 ) — — (1,518 ) Long-term derivative liabilities included in other long-term liabilities, net 972 (1,063 ) (91 ) — — (91 ) Total at March 31, 2019 $ 9,061 $ (10,670 ) $ (1,609 ) $ — $ — $ (1,609 ) Fair asset value of derivative instruments $ 17,710 $ — $ 17,710 $ — $ — $ 17,710 Long-term derivative assets included in other long-term assets, net 906 (103 ) 803 — — 803 Fair liability value of derivative instruments — — — — — — Long-term derivative liabilities included in other long-term liabilities, net — — — — — — Total at September 30, 2018 $ 18,616 $ (103 ) $ 18,513 $ — $ — $ 18,513
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 Amount of (Gain) or Loss Recognized Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10 Location of (Gain) or Loss Recognized in Income on Derivative Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 Six Months Ended March 31, 2019 Six Months Ended March 31, 2018 Commodity contracts Cost of product (a) $ 14,345 $ (9,561 ) $ 8,193 $ (9,377 ) Commodity contracts Cost of installations and service (a) $ 403 $ 11 $ 650 $ (571 ) Commodity contracts Delivery and branch expenses (a) $ 271 $ (45 ) $ 437 $ (1,274 ) Commodity contracts (Increase) / decrease in the fair value of derivative instruments (b) $ (13,401 ) $ 11,609 $ 17,638 $ 209 (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)	6 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Components of Inventory	The components of inventory were as follows (in thousands): March 31, 2019 September 30, 2018 Product $ 38,130 $ 34,618 Parts and equipment 21,989 21,759 Total inventory $ 60,119 $ 56,377

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Mar. 31, 2019
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): March 31, 2019 September 30, 2018 Property and equipment $ 215,725 $ 210,581 Less: accumulated depreciation 126,379 122,963 Property and equipment, net $ 89,346 $ 87,618

Goodwill and Intangibles, net (

Goodwill and Intangibles, net (Tables)	6 Months Ended
	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in the Company's Goodwill	A summary of changes in Company’s goodwill is as follows (in thousands): Balance as of September 30, 2018 $ 228,436 Fiscal year 2019 business combinations 10,858 Balance as of March 31, 2019 $ 239,294
Intangible Assets Subject to Amortization	The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands): March 31, 2019 September 30, 2018 Gross Gross Carrying Accum. Carrying Accum. Amount Amortization Net Amount Amortization Net Customer lists $ 359,073 $ 288,214 $ 70,859 $ 358,776 $ 279,990 $ 78,786 Trade names and other intangibles 32,740 14,110 18,630 32,739 13,081 19,658 Total $ 391,813 $ 302,324 $ 89,489 $ 391,515 $ 293,071 $ 98,444

Long-Term Debt and Bank Facil_2

Long-Term Debt and Bank Facility Borrowings (Tables)	6 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Company's Debt	The Company’s debt is as follows (in thousands): March 31, September 30, 2019 2018 Carrying Amount Fair Value (a) Carrying Amount Fair Value (a) Revolving Credit Facility Borrowings $ 115,000 $ 115,000 $ 1,500 $ 1,500 Senior Secured Term Loan (b) 96,857 97,500 99,280 100,000 Total debt $ 211,857 $ 212,500 $ 100,780 $ 101,500 Total short-term portion of debt $ 125,000 $ 125,000 $ 9,000 $ 9,000 Total long-term portion of debt $ 86,857 $ 87,500 $ 91,780 $ 92,500 (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 $0.6 million as of March 31, 2019 and $0.7 million as of September 30, 2018.

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Current and Deferred Income Tax Expense (Benefit)	The current and deferred income tax expense (benefit) for the three and six months ended March 31, 2019, and 2018 are as follows: Three Months Ended Six Months Ended March 31, March 31, (in thousands) 2019 2018 2019 2018 Income before income taxes $ 101,564 $ 82,783 $ 104,852 $ 111,453 Current tax expense (benefit) 37,958 (1,989 ) 39,547 (761 ) Deferred tax (benefit) expense (8,719 ) 29,778 (9,335 ) 38,490 Deferred tax (benefit) expense - impact of tax reform - 216 - (11,236 ) Total deferred tax (benefit) expense (8,719 ) 29,994 (9,335 ) 27,254 Total tax expense $ 29,239 $ 28,005 $ 30,212 $ 26,493

Supplemental Disclosure of Ca_2

Supplemental Disclosure of Cash Flow Information (Tables)	6 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	Six Months Ended Cash paid during the period for: March 31, (in thousands) 2019 2018 Income taxes, net $ 3,748 $ 479 Interest $ 5,770 $ 4,415

Earnings Per Limited Partner _2

Earnings Per Limited Partner Unit (Tables)	6 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Net Income Allocation and Per Unit Data	The following presents the net income allocation and per unit data using this method for the periods presented: Three Months Ended Six Months Ended Basic and Diluted Earnings Per Limited Partner: March 31, March 31, (in thousands, except per unit data) 2019 2018 2019 2018 Net income $ 72,325 $ 54,778 $ 74,640 $ 84,960 Less General Partner’s interest in net income 454 319 469 494 Net income available to limited partners 71,871 54,459 74,171 84,466 Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 12,934 9,444 12,294 14,423 Limited Partner’s interest in net income under FASB ASC 260-10-45-60 $ 58,937 $ 45,015 $ 61,877 $ 70,043 Per unit data: Basic and diluted net income available to limited partners $ 1.40 $ 0.98 $ 1.42 $ 1.51 Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 0.25 0.17 0.23 $ 0.25 Limited Partner’s interest in net income under FASB ASC 260-10-45-60 $ 1.15 $ 0.81 $ 1.19 $ 1.26 Weighted average number of Limited Partner units outstanding 51,427 55,642 52,174 55,766

Organization - Additional Infor

Organization - Additional Information (Detail) shares in Thousands	Jul. 02, 2018USD ($)	Jul. 30, 2015USD ($)	Mar. 31, 2019SegmentCustomerContractshares	Dec. 31, 2018shares	Sep. 30, 2018shares	Mar. 31, 2018shares	Dec. 31, 2017shares	Sep. 30, 2017shares
Limited Partners' Capital Account [Line Items]
Number of reportable segments | Segment			1
Percentage of general partner interest			0.60%
Non Seasonal maximum borrowing capacity under revolving credit facility	$ 300,000,000
Fourth Amendment
Limited Partners' Capital Account [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility	300,000,000	$ 300,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility	450,000,000	$ 450,000,000
Due date of debt		Jul. 2, 2023
Fourth Amendment | Term Loan
Limited Partners' Capital Account [Line Items]
Outstanding senior notes	$ 100,000,000	$ 100,000,000
Senior secured term loan maturity period	5 years	5 years
Petro Holdings, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of Star Acquisitions Inc.			100.00%
Number of residential and commercial home heating oil and propane customers served | Customer			448,000
Number of customers to whom only home heating oil, gasoline and diesel were sells on a delivery only basis | Customer			81,000
Number of service contracts heating oil and propane for natural gas and other heating systems | Contract			17,000
Star Group L.P.
Limited Partners' Capital Account [Line Items]
Percentage of limited partner interest			99.40%
Star Acquisitions, Inc
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership			100.00%
Petroleum Heat and Power Co., Inc.
Limited Partners' Capital Account [Line Items]
Ownership interest of partnership			100.00%
Common Stock
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares			50,302	52,489	53,088	54,607	55,888	55,888
General Partner
Limited Partners' Capital Account [Line Items]
Number of outstanding units | shares			326	326	326	326	326	326

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		1 Months Ended		6 Months Ended		12 Months Ended
		Apr. 30, 2019	Apr. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Significant Accounting Policies [Line Items]
Cash, cash equivalents, and restricted cash				$ 16,622,000	$ 35,679,000				$ 14,781,000	$ 52,708,000
Cash and cash equivalents				16,372,000					14,531,000
Restricted cash				250,000					250,000
Captive insurance collateral, debt securities	[1]			54,148,000					45,419,000
Accrued expenses and other current liabilities				157,524,000					116,436,000
Other long-term liabilities				$ 24,692,000					24,012,000
Operating lease expiration year				2033
Undiscounted future minimum lease payments through 2033				$ 126,500,000
ASU 2014-09
Schedule Of Significant Accounting Policies [Line Items]
Revenue, practical expedient, financing component [true false]				true
New England Teamsters & Trucking Industry Pension Fund
Schedule Of Significant Accounting Policies [Line Items]
Accrued expenses and other current liabilities				$ 200,000
Other long-term liabilities				17,000,000
Subsidiaries of Swiss Re
Schedule Of Significant Accounting Policies [Line Items]
Additional payment obligated to pay if degree days exceed ten year average				5,000,000
Charge on weather hedge contract					$ 1,900,000
Payments of derivative hedging contract			$ 1,900,000
Subsidiaries of Swiss Re | Subsequent Event
Schedule Of Significant Accounting Policies [Line Items]
Payments of derivative hedging contract		$ 2,100,000
Subsidiaries of Swiss Re | Delivery and branch expenses
Schedule Of Significant Accounting Policies [Line Items]
Charge on weather hedge contract				2,100,000
Subsidiaries of Swiss Re | Scenario Forecast
Schedule Of Significant Accounting Policies [Line Items]
Derivative maximum payout						$ 5,000,000	$ 5,000,000	$ 5,000,000
Significant Other Observable Inputs Level 2 | New England Teamsters & Trucking Industry Pension Fund
Schedule Of Significant Accounting Policies [Line Items]
Multiemployer plan discounted withdrawal liability				21,300,000
Captive Insurance Collateral | Level 1
Schedule Of Significant Accounting Policies [Line Items]
Captive insurance collateral, debt securities				52,700,000					44,800,000
Captive Insurance Collateral | Mutual Funds
Schedule Of Significant Accounting Policies [Line Items]
Captive insurance collateral, net asset value				$ 1,500,000					$ 600,000
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Cash equivalents, highly liquid investments maturity				3 months
Maximum | Subsidiaries of Swiss Re | Scenario Forecast
Schedule Of Significant Accounting Policies [Line Items]
Derivative maximum receivable						$ 12,500,000	$ 12,500,000	$ 12,500,000
[1]	See Note 2 – Significant Accounting Policies – Captive Insurance Collateral.

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Impact of Adoption on Condensed Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Sales:
Total sales		$ 699,582		$ 684,031		$ 1,234,609	$ 1,120,865
Cost and expenses:
Delivery and branch expenses		110,684		106,605		213,357	197,809
Operating income		105,002		85,473		111,065	116,539
Income before income taxes		101,564		82,783		104,852	111,453
Income tax expense		29,239		28,005		30,212	26,493
Net income		72,325	$ 2,315	54,778	$ 30,182	74,640	84,960
General Partner’s interest in net income		454		319		469	494
Limited Partners’ interest in net income		$ 71,871		$ 54,459		$ 74,171	$ 84,466
Basic and diluted income per Limited Partner Unit	[1]	$ 1.15		$ 0.81		$ 1.19	$ 1.26
Balances Without Adoption of ASC 606 | ASU 2014-09
Sales:
Total sales		$ 703,882				$ 1,240,829
Cost and expenses:
Delivery and branch expenses		111,163				216,372
Operating income		108,823				114,270
Income before income taxes		105,385				108,057
Income tax expense		30,344				31,135
Net income		75,041				76,922
General Partner’s interest in net income		470				483
Limited Partners’ interest in net income		$ 74,571				$ 76,439
Basic and diluted income per Limited Partner Unit		$ 1.19				$ 1.22
Effect of Change Higher/(Lower) | ASU 2014-09
Sales:
Total sales		$ (4,300)				$ (6,220)
Cost and expenses:
Delivery and branch expenses		(479)				(3,015)
Operating income		(3,821)				(3,205)
Income before income taxes		(3,821)				(3,205)
Income tax expense		(1,105)				(923)
Net income		(2,716)				(2,282)
General Partner’s interest in net income		(16)				(14)
Limited Partners’ interest in net income		$ (2,700)				$ (2,268)
Basic and diluted income per Limited Partner Unit		$ (0.04)				$ (0.03)
Product
Sales:
Total sales		$ 637,400		$ 622,962		$ 1,096,107	$ 989,696
Product | Balances Without Adoption of ASC 606 | ASU 2014-09
Sales:
Total sales		643,407				1,105,560
Product | Effect of Change Higher/(Lower) | ASU 2014-09
Sales:
Total sales		(6,007)				(9,453)
Installations and services
Sales:
Total sales		62,182		$ 61,069		138,502	$ 131,169
Installations and services | Balances Without Adoption of ASC 606 | ASU 2014-09
Sales:
Total sales		60,475				135,269
Installations and services | Effect of Change Higher/(Lower) | ASU 2014-09
Sales:
Total sales		$ 1,707				$ 3,233
[1]	See Note 15 - Earnings Per Limited Partner Unit.

Revenue Recognition - Schedul_2

Revenue Recognition - Schedule of Impact of Adoption on Condensed Consolidated Statement of Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
ASSETS
Prepaid expenses and other current assets	$ 32,288	$ 35,451
Deferred charges and other assets, net	18,539	13,067
Liabilities
Accrued expenses and other current liabilities	157,524	116,436
Unearned service contract revenue	63,718	60,700
Deferred tax liabilities, net	15,872	21,206
Partners’ capital
Common unitholders	373,748	329,129
General partner	(1,146)	$ (1,303)
Balances Without Adoption of ASC 606 | ASU 2014-09
ASSETS
Prepaid expenses and other current assets	27,701
Deferred charges and other assets, net	11,962
Liabilities
Accrued expenses and other current liabilities	158,447
Unearned service contract revenue	62,341
Deferred tax liabilities, net	12,104
Partners’ capital
Common unitholders	366,852
General partner	(1,192)
Effect of Change Higher/(Lower) | ASU 2014-09
ASSETS
Prepaid expenses and other current assets	4,587
Deferred charges and other assets, net	6,577
Liabilities
Accrued expenses and other current liabilities	(923)
Unearned service contract revenue	1,377
Deferred tax liabilities, net	3,768
Partners’ capital
Common unitholders	6,896
General partner	$ 46

Revenue Recognition - Summary o

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

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - USD ($)	6 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Revenue Recognition [Line Items]
Revenue, practical expedient, incremental cost of obtaining contract [true false]	true
Contract costs, amortization period	5 years
Contract costs, impairment loss	$ 0
Contract liabilities	82,500,000	$ 118,600,000
Contract with customer liability, revenue recognized	90,300,000
Prepaid Expense and Other Current Assets
Revenue Recognition [Line Items]
Deferred contract costs,current	3,600,000
Deferred Charges and Other Assets, Net
Revenue Recognition [Line Items]
Deferred contract costs,non current	$ 6,600,000
Maximum
Revenue Recognition [Line Items]
Contract liabilities recognition service contract period	1 year
Equipment Maintenance Service Contracts | Maximum
Revenue Recognition [Line Items]
Revenue from service contracts period of recognition	1 year
Residential and Commercial Home Heating Oil Customers
Revenue Recognition [Line Items]
Percentage of customers receiving deliveries based on prevailing weather conditions	95.00%
Residential Customers
Revenue Recognition [Line Items]
Customer payment terms	30 days
Percentage of customers take advantage of smart pay budget payment plan	33.00%

Common Unit Repurchase and Reti

Common Unit Repurchase and Retirement - Additional Information (Detail) - USD ($) shares in Thousands	Jul. 02, 2018	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2019
Capital Unit [Line Items]
Availability required to repurchase common units	$ 45,000,000
Percentage of the maximum facility size on a historical proforma and forward-looking basis	15.00%
Non Seasonal maximum borrowing capacity under revolving credit facility	$ 300,000,000
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units	115.00%
Repurchase Plan
Capital Unit [Line Items]
Company's common units repurchased and retired		197	1,474	516	2,187	599	7,937
Company's common units authorized for repurchase							10,900
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase							8,400
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units repurchased and retired								1,200
Company's common units authorized for repurchase							2,500
Common Stock Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units repurchased and retired								7,100

Common Unit Repurchase and Re_2

Common Unit Repurchase and Retirement - Company's Repurchase Activities (Detail) - $ / shares shares in Thousands		1 Months Ended					3 Months Ended		72 Months Ended
		Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019		Jan. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			197	1,474		516	2,187	599	7,937
Average Price Paid per Unit	[1]		$ 9.74	$ 9.41		$ 9.39	$ 9.44	$ 9.57	$ 7.11
Maximum Number of Units that May Yet Be Purchased			2,573	2,770	[2]	4,244	2,573	4,760	5,359
Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		222
Average Price Paid per Unit	[1]	$ 9.67
Maximum Number of Units that May Yet Be Purchased	[3]	2,351
Publicly Announced Plans or Programs As Part of Repurchase Plan
Capital Unit [Line Items]
Total Number of Units Purchased			197	1,474		516	2,187	599	5,493
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event
Capital Unit [Line Items]
Total Number of Units Purchased		222
[1]	Amount includes repurchase costs.
[2]	February 2019 common units repurchased include 1.2 million common units acquired in a private transaction.
[3]	Of the total available for repurchase, approximately 1.1 million are available for repurchase in open market transactions and 1.3 million are available for repurchase in privately-negotiated transactions.

Common Unit Repurchase and Re_3

Common Unit Repurchase and Retirement - Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions	1 Months Ended
	Feb. 28, 2019	Apr. 30, 2019	Sep. 30, 2018
Private Transaction
Capital Unit [Line Items]
Company's common units repurchased	1.2
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase			8.4
Common Stock Available for Repurchase Under Open Market Transactions | Subsequent Event
Capital Unit [Line Items]
Company's common units authorized for repurchase		1.1
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase			2.5
Common Stock Available for Repurchase Under Privately Negotiated Transactions | Subsequent Event
Capital Unit [Line Items]
Company's common units authorized for repurchase		1.3

Captive Insurance Collateral -

Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		$ 54,056	$ 46,623
Gross Unrealized Gain		127
Gross Unrealized (Loss)		(35)	(1,204)
Fair Value	[1]	54,148	45,419
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		376	350
Fair Value		376	350
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		24,290	10,735
Gross Unrealized Gain		49
Gross Unrealized (Loss)		(2)	(192)
Fair Value		24,337	10,543
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		25,298	30,427
Gross Unrealized Gain		76
Gross Unrealized (Loss)		(27)	(928)
Fair Value		25,347	29,499
Foreign Bonds and Notes
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		4,092	5,111
Gross Unrealized Gain		2
Gross Unrealized (Loss)		(6)	(84)
Fair Value		$ 4,088	$ 5,027
[1]	See Note 2 – Significant Accounting Policies – Captive Insurance Collateral.

Captive Insurance Collateral _2

Captive Insurance Collateral - Schedule of Maturities of Investments (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]
Due within one year		$ 5,333
Due after one year through five years		33,865
Due after five years through ten years		14,950
Total	[1]	$ 54,148	$ 45,419
[1]	See Note 2 – Significant Accounting Policies – Captive Insurance Collateral.

Derivatives and Hedging-Discl_3

Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) gal in Millions	3 Months Ended
	Mar. 31, 2019USD ($)gal	Mar. 31, 2018gal	Sep. 30, 2018USD ($)	Aug. 31, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedging positions and payable amounts secured under credit facility | $	$ 3,500,000		$ 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 | $	1,600,000
Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value | $				$ 50,000,000
Percentage of market risk exposure of long term debt				50.00%
Fair Value | $	$ (1,100,000)		$ 39,000
Call Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	2.2	2.2
Call Option | Synthetic calls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	54.9	53.3
Put Option
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	3.4	4.2
Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	7.2	8.8
Future Contracts | Long
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	33.1	34.4
Future Contracts | Short
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	50.8	53.4
Hedge its Internal Fuel Usage and Other Related Activities Short Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	0.8
Hedge its Internal Fuel Usage and Other Related Activities Swap Contracts Bought
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative activity volume	1.8	1.1

Derivatives and Hedging-Discl_4

Derivatives and Hedging-Disclosures and Fair Value Measurements - Company's 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	Mar. 31, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	$ 9,061	$ 18,616
Derivative Liabilities, commodity contracts	(10,670)	(103)
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	8,089	17,710
Other long-term liabilities, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	972
Fair liability and fair asset value of derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, commodity contracts	(9,607)
Other long-term liabilities, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, commodity contracts	(1,063)
Deferred charges and other assets, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts		906
Derivative Liabilities, commodity contracts		(103)
Significant Other Observable Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	9,061	18,616
Derivative Liabilities, commodity contracts	(10,670)	(103)
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	8,089	17,710
Significant Other Observable Inputs Level 2 | Other long-term liabilities, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts	972
Significant Other Observable Inputs Level 2 | Fair liability and fair asset value of derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, commodity contracts	(9,607)
Significant Other Observable Inputs Level 2 | Other long-term liabilities, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, commodity contracts	$ (1,063)
Significant Other Observable Inputs Level 2 | Deferred charges and other assets, net balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, commodity contracts		906
Derivative Liabilities, commodity contracts		$ (103)

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	Mar. 31, 2019	Sep. 30, 2018
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net Assets (Liabilities) Presented in the Statement of Financial Position		$ 17,710
Net Assets (Liabilities) Presented in the Statement of Financial Position	$ (1,518)
Subject to an enforceable master netting arrangement
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	9,061	18,616
Gross Liabilities Offset in the Statement of Financial Position	(10,670)	(103)
Net Assets (Liabilities) Presented in the Statement of Financial Position	(1,609)	18,513
Financial Instruments		0
Cash Collateral Received		0
Net Amount	(1,609)	18,513
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized		17,710
Net Assets (Liabilities) Presented in the Statement of Financial Position		17,710
Financial Instruments		0
Cash Collateral Received		0
Net Amount		17,710
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		906
Gross Liabilities Offset in the Statement of Financial Position		(103)
Net Assets (Liabilities) Presented in the Statement of Financial Position		803
Financial Instruments		0
Cash Collateral Received		0
Net Amount		803
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	8,089
Gross Liabilities Offset in the Statement of Financial Position	(9,607)
Net Assets (Liabilities) Presented in the Statement of Financial Position	(1,518)
Financial Instruments		0
Cash Collateral Received		0
Net Amount	(1,518)
Subject to an enforceable master netting arrangement | Other long-term liabilities
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	972
Gross Liabilities Offset in the Statement of Financial Position	(1,063)
Net Assets (Liabilities) Presented in the Statement of Financial Position	(91)
Financial Instruments		0
Cash Collateral Received		$ 0
Net Amount	$ (91)

Derivatives and Hedging - Discl

Derivatives and Hedging - Disclosures and Fair Value Measurements - Effect of Derivative Instruments on Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Unrealized, commodity contracts	[1]	$ (13,401)	$ 11,609	$ 17,638	$ 209
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]	14,345	(9,561)	8,193	(9,377)
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]	403	11	650	(571)
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]	$ 271	$ (45)	$ 437	$ (1,274)
[1]	Represents the change in value of unrealized open positions and expired options.
[2]	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	Mar. 31, 2019	Sep. 30, 2018
Inventory Disclosure [Abstract]
Product	$ 38,130	$ 34,618
Parts and equipment	21,989	21,759
Total inventory	$ 60,119	$ 56,377

Property and Equipment - Compon

Property and Equipment - Component of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Property Plant And Equipment [Abstract]
Property and equipment	$ 215,725	$ 210,581
Less: accumulated depreciation	126,379	122,963
Property and equipment, net	$ 89,346	$ 87,618

Business Combinations - Additio

Business Combinations - Additional Information (Detail) - Propane Dealer $ in Millions	6 Months Ended
	Mar. 31, 2019USD ($)
Business Acquisition [Line Items]
Aggregate purchase price partnership acquired	$ 13.7
Aggregate purchase price allocation, intangible assets	11.2
Aggregate purchase price allocation, fixed assets	2.7
Gross purchase price increased (reduced) by working capital credits	$ (0.2)

Goodwill and Intangibles, net -

Goodwill and Intangibles, net - Summary of Changes in the Company's Goodwill (Detail) $ in Thousands	6 Months Ended
	Mar. 31, 2019USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance on beginning	$ 228,436
Fiscal year business combinations	10,858
Balance on ending	$ 239,294

Goodwill and Intangibles, net_2

Goodwill and Intangibles, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 391,813	$ 391,515
Accum. Amortization	302,324	293,071
Net	89,489	98,444
Customer Lists
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	359,073	358,776
Accum. Amortization	288,214	279,990
Net	70,859	78,786
Trade Names And Other Intangibles
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	32,740	32,739
Accum. Amortization	14,110	13,081
Net	$ 18,630	$ 19,658

Goodwill and Intangibles, net_3

Goodwill and Intangibles, net - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 9.3	$ 9.6

Long-Term Debt and Bank Facil_3

Long-Term Debt and Bank Facility Borrowings - Company's Debt (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Long-term debt, carrying Amount		$ 211,857	$ 100,780
Current maturities of long-term debt, carrying Amount		125,000	9,000
Long-term debt		86,857	91,780
Long-term debt, fair value	[1]	212,500	101,500
Current maturities of long-term debt, fair value	[1]	125,000	9,000
Long-term portion of debt, fair value	[1]	87,500	92,500
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowings, carrying Amount		115,000	1,500
Credit facility borrowings, fair value	[1]	115,000	1,500
Term Loan
Debt Instrument [Line Items]
Long-term debt, carrying Amount	[2]	96,857	99,280
Long-term debt, fair value	[1],[2]	$ 97,500	$ 100,000
[1]	The face amount of the Company’s variable rate long-term debt approximates fair value.
[2]	Carrying amounts are net of unamortized debt issuance costs of $0.6 million as of March 31, 2019 and $0.7 million as of September 30, 2018.

Long-Term Debt and Bank Facil_4

Long-Term Debt and Bank Facility Borrowings - Company's Debt (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Term Loan
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 0.6	$ 0.7

Long-Term Debt and Bank Facil_5

Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) - USD ($)		Jul. 02, 2018	Jul. 30, 2015	Mar. 31, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility		$ 300,000,000
Hedging positions and payable amounts secured under credit facility				$ 3,500,000	$ 0
Letters of credit issued and outstanding				7,100,000	7,100,000
Long-term debt, fair value	[1]			212,500,000	101,500,000
Revolving credit facility outstanding				115,000,000	1,500,000
Availability in compliance with the fixed charge coverage ratio				174,400,000	189,000,000
Term Loan
Debt Instrument [Line Items]
Long-term debt, fair value	[1],[2]			97,500,000	100,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility outstanding				$ 115,000,000	$ 1,500,000
Fourth Amendment
Debt Instrument [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility		300,000,000	$ 300,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility		450,000,000	450,000,000
Issuance of line of credit for working capital purposes		$ 25,000,000
Revolving credit facility expiry		Jul. 2, 2023
Additional revolving credit		$ 200,000,000
Facility size that can be increased without consulting bank group		$ 200,000,000
Term loan annual payment percentage		25.00%
Debt instrument, effective interest rate				5.70%	5.20%
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		110.00%
Availability percentage to maximum facility size		12.50%
Fourth Amendment | Maximum
Debt Instrument [Line Items]
Senior secured leverage ratio during quarters ending June or September		300.00%
Senior secured leverage ratio during quarters ending December or March		450.00%
Fourth Amendment | Quarterly
Debt Instrument [Line Items]
Term loan periodic payment		$ 2,500,000
Fourth Amendment | Annually | Maximum
Debt Instrument [Line Items]
Term loan periodic payment		15,000,000
Fourth Amendment | Term Loan
Debt Instrument [Line Items]
Outstanding senior notes		$ 100,000,000	$ 100,000,000
Senior secured term loan maturity period		5 years	5 years
Fourth Amendment | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, effective interest rate				4.70%	3.80%
[1]	The face amount of the Company’s variable rate long-term debt approximates fair value.
[2]	Carrying amounts are net of unamortized debt issuance costs of $0.6 million as of March 31, 2019 and $0.7 million as of September 30, 2018.

Income Taxes - Current and Defe

Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Deferred Income Tax Assets And Liabilities
Income before income taxes	$ 101,564	$ 82,783	$ 104,852	$ 111,453
Current tax expense (benefit)	37,958	(1,989)	39,547	(761)
Deferred tax (benefit) expense	(8,719)	29,778	(9,335)	38,490
Deferred tax (benefit) expense - impact of tax reform		216		(11,236)
Total deferred tax (benefit) expense	(8,719)	29,994	(9,335)	27,254
Total tax expense	$ 29,239	$ 28,005	$ 30,212	$ 26,493

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Line Items]
Effective tax rate		28.80%	23.80%
Provisional remeasurement of deferred tax liabilities resulted in an discrete tax benefit		$ 0	$ 11,200,000
Effective income tax rate excluding impact of net deferred tax liability		28.80%	33.90%
Unrecognized income tax benefits		$ 0
Federal
Income Tax Disclosure [Abstract]
Number of years for examination		4 years
Federal | Tax Year 2017
Income Tax Disclosure [Line Items]
Corporate income tax rate	35.00%
Federal | Tax Year2019
Income Tax Disclosure [Line Items]
Corporate income tax rate		21.00%
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 (Detail) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash paid during the period for:
Income taxes, net	$ 3,748	$ 479
Interest	$ 5,770	$ 4,415

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				6 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Basic and Diluted Earnings Per Limited Partner:
Net income		$ 72,325	$ 2,315	$ 54,778	$ 30,182	$ 74,640	$ 84,960
Less General Partner’s interest in net income		454		319		469	494
Limited Partners’ interest in net income		71,871		54,459		74,171	84,466
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60		12,934		9,444		12,294	14,423
Limited Partner’s interest in net income under FASB ASC 260-10-45-60		$ 58,937		$ 45,015		$ 61,877	$ 70,043
Per unit data:
Basic and diluted net income available to limited partners		$ 1.40		$ 0.98		$ 1.42	$ 1.51
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60		0.25		0.17		0.23	0.25
Limited Partner’s interest in net income under FASB ASC 260-10-45-60	[1]	$ 1.15		$ 0.81		$ 1.19	$ 1.26
Weighted average number of Limited Partner units outstanding		51,427		55,642		52,174	55,766
[1]	See Note 15 - Earnings Per Limited Partner Unit.

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Subsequent Event $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended
	Apr. 30, 2019USD ($)$ / sharesshares
Plan III Common Units Repurchase Program
Subsequent Event [Line Items]
Company's common units repurchased and retired | shares	0.2
Average price paid per unit | $ / shares	$ 9.67
Dividend Declared
Subsequent Event [Line Items]
Distribution declared | $ / shares	0.125
Partners capital projected distribution amount on annualized basis | $ / shares	0.50
Minimum dividend distribution per unit | $ / shares	$ 0.0675
Amount to paid to common unit holders | $	$ 6,300
Amount to paid to the General Partner | $	230
Incentive distribution to the General Partner | $	200
Incentive distributions to management | $	$ 200
Dividend payable date	May 6, 2019
Dividend record date	Apr. 26, 2019