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

3 Months Ended

Dec. 31, 2018

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 December 31, 2018
Commodity contracts	Fair liability value of derivative instruments	$	38,247		$	—	$	38,247
Commodity contracts	Long-term derivative assets included in the deferred charges and other assets, net and  other long-term liabilities, net balance		2,193			—		2,193
Commodity contract assets at December 31, 2018		$	40,440		$	—	$	40,440
Liability Derivatives at December 31, 2018
Commodity contracts	Fair liability value of derivative instruments	$	(56,312	)	$	—	$	(56,312	)
Commodity contracts	Long-term derivative liabilities included in the deferred charges and other assets, net and  other long-term liabilities, net balance		(2,445	)		—		(2,445	)
Commodity contract liabilities at December 31, 2018		$	(58,757	)	$	—	$	(58,757	)
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) Presentedin the 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		17		(14	)		3			—		—		3
Fair liability value of derivative instruments		38,247		(56,312	)		(18,065	)		—		—		(18,065	)
Long-term derivative liabilities included in    other long-term liabilities, net		2,176		(2,431	)		(255	)		—		—		(255	)
Total at December 31, 2018	$	40,440	$	(58,757	)	$	(18,317	)	$	—	$	—	$	(18,317	)
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) Presentedin the 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		17		(14	)		3			—		—		3
Fair liability value of derivative instruments		38,247		(56,312	)		(18,065	)		—		—		(18,065	)
Long-term derivative liabilities included in    other long-term liabilities, net		2,176		(2,431	)		(255	)		—		—		(255	)
Total at December 31, 2018	$	40,440	$	(58,757	)	$	(18,317	)	$	—	$	—	$	(18,317	)
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
Derivatives Not Designated as Hedging Instruments Under FASB ASC 815-10	Location of (Gain) or Loss Recognized in Income on Derivative	Three Months Ended December 31, 2018			Three Months Ended December 31, 2017
Commodity contracts	Cost of product (a)	$	(6,152	)	$	184
Commodity contracts	Cost of installations and service (a)	$	247		$	(582	)
Commodity contracts	Delivery and branch expenses (a)	$	166		$	(1,229	)
Commodity contracts	(Increase) / decrease in the fair value of derivative instruments (b)	$	31,039		$	(11,400	)

(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.