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

12 Months Ended

Sep. 30, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

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

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 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 at 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	Cash collateral		-			—		—
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net balance		(103	)		—		(103	)
Commodity contract liabilities at September 30, 2018		$	(103	)	$	—	$	(103	)
	Asset Derivatives at September 30, 2017
Commodity contracts	Fair asset and fair liability value of derivative instruments	$	7,729		$	—	$	7,729
Commodity contracts	Long-term derivative assets included in the deferred charges and other assets, net balance		996			—		996
Commodity contract assets at September 30, 2017		$	8,725		$	—	$	8,725
	Liability Derivatives at September 30, 2017
Commodity contracts	Fair liability and fair asset value of derivative instruments	$	(2,086	)	$	—	$	(2,086	)
Commodity contracts	Cash collateral		—			—		—
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net and other long-term liabilities balances		(731	)		—		(731	)
Commodity contract liabilities at September 30, 2017		$	(2,817	)	$	—	$	(2,817	)

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 in the Statement of Financial Position			Financial Instruments		Cash Collateral Received		Net Amount
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
Fair asset value of derivative instruments	$	6,023	$	(91	)	$	5,932		$	—	$	—	$	5,932
Long-term derivative assets included in other long-term assets, net		996		(730	)		266			—		—		266
Fair liability value of derivative instruments		1,706		(1,995	)		(289	)		—		—		(289	)
Long-term derivative liabilities included in other long-term liabilities, net		—		(1	)		(1	)		—		—		(1	)
Total at September 30, 2017	$	8,725	$	(2,817	)	$	5,908		$	—	$	—	$	5,908

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 in the Statement of Financial Position			Financial Instruments		Cash Collateral Received		Net Amount
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
Fair asset value of derivative instruments	$	6,023	$	(91	)	$	5,932		$	—	$	—	$	5,932
Long-term derivative assets included in other long-term assets, net		996		(730	)		266			—		—		266
Fair liability value of derivative instruments		1,706		(1,995	)		(289	)		—		—		(289	)
Long-term derivative liabilities included in other long-term liabilities, net		—		(1	)		(1	)		—		—		(1	)
Total at September 30, 2017	$	8,725	$	(2,817	)	$	5,908		$	—	$	—	$	5,908

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
		Years Ended September 30,
Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10	Location of (Gain) or Loss Recognized in Income on Derivative	2018			2017			2016
Commodity contracts	Cost of product (a)	$	10,379		$	6,386		$	16,977
Commodity contracts	Cost of installations and service (a)	$	(726	)	$	(526	)	$	949
Commodity contracts	Delivery and branch expenses (a)	$	(1,403	)	$	(422	)	$	2,405
Commodity contracts	(Increase) / decrease in the fair value of derivative instruments (b)	$	(11,408	)	$	(2,193	)	$	(18,217	)

(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.