Derivatives and Hedging-Disclosures and Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Company's Commodity Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company’s commodity financial assets and liabilities measured at fair value on a recurring basis are listed on the following table.

(In thousands)					Fair Value Measurements at Reporting Date Using:
Derivatives Not Designated    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, 2021
Commodity contracts	Fair asset value of derivative instruments	$	15,082		$	—	$	15,082
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net		1,246			—		1,246
Commodity contract assets at March 31, 2021		$	16,328		$	—	$	16,328
Liability Derivatives at March 31, 2021
Commodity contracts	Fair asset value of derivative instruments	$	(3,666	)	$	—	$	(3,666	)
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net		(445	)		—		(445	)
Commodity contract liabilities at March 31, 2021		$	(4,111	)	$	—	$	(4,111	)
Asset Derivatives at September 30, 2020
Commodity contracts	Fair liability value of derivative instruments	$	24,274		$	—	$	24,274
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances		1,890			—		1,890
Commodity contract assets September 30, 2020		$	26,164		$	—	$	26,164
Liability Derivatives at September 30, 2020
Commodity contracts	Fair liability value of derivative instruments	$	(35,711	)	$	—	$	(35,711	)
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities, net balances		(1,779	)		—		(1,779	)
Commodity contract liabilities September 30, 2020		$	(37,490	)	$	—	$	(37,490	)

Company's Commodity Derivatives Assets (Liabilities) Offset by Counterparty

The Company’s commodity derivative assets (liabilities) offset by counterparty and subject to an enforceable master netting arrangement are listed on the following table.

(In thousands)									Gross Amounts Not Offset in the 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 in the Statement of Financial Position			Financial Instruments		Cash Collateral Received		Net Amount
Fair asset value of derivative instruments	$	15,082	$	(3,666	)	$	11,416		$	—	$	—	$	11,416
Long-term derivative assets included in    deferred charges and other assets, net		1,246		(445	)		801			—		—		801
Total at March 31, 2021	$	16,328	$	(4,111	)	$	12,217		$	—	$	—	$	12,217
Long-term derivative assets included in other long-term assets, net	$	1,605	$	(1,478	)	$	127		$	—	$	—	$	127
Fair liability value of derivative instruments		24,274		(35,711	)		(11,437	)		—		—		(11,437	)
Long-term derivative liabilities included in other long-term liabilities, net		285		(301	)		(16	)		—		—		(16	)
Total at September 30, 2020	$	26,164	$	(37,490	)	$	(11,326	)	$	—	$	—	$	(11,326	)

Company's Commodity Derivatives Assets (Liabilities) Offset by Counterparty

The Company’s commodity derivative assets (liabilities) offset by counterparty and subject to an enforceable master netting arrangement are listed on the following table.

(In thousands)									Gross Amounts Not Offset in the 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 in the Statement of Financial Position			Financial Instruments		Cash Collateral Received		Net Amount
Fair asset value of derivative instruments	$	15,082	$	(3,666	)	$	11,416		$	—	$	—	$	11,416
Long-term derivative assets included in    deferred charges and other assets, net		1,246		(445	)		801			—		—		801
Total at March 31, 2021	$	16,328	$	(4,111	)	$	12,217		$	—	$	—	$	12,217
Long-term derivative assets included in other long-term assets, net	$	1,605	$	(1,478	)	$	127		$	—	$	—	$	127
Fair liability value of derivative instruments		24,274		(35,711	)		(11,437	)		—		—		(11,437	)
Long-term derivative liabilities included in other long-term liabilities, net		285		(301	)		(16	)		—		—		(16	)
Total at September 30, 2020	$	26,164	$	(37,490	)	$	(11,326	)	$	—	$	—	$	(11,326	)

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, 2021			Three Months Ended March 31, 2020			Six Months Ended March 31, 2021			Six Months Ended March 31, 2020
Commodity contracts	Cost of product (a)	$	(5,064	)	$	(3,700	)	$	6,514		$	2,349
Commodity contracts	Cost of installations and service (a)	$	(130	)	$	233		$	(37	)	$	224
Commodity contracts	Delivery and branch expenses (a)	$	(193	)	$	626		$	8		$	597
Commodity contracts	(Increase) / decrease in the fair value of derivative instruments (b)	$	(8,224	)	$	11,670		$	(25,619	)	$	5,253

(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.