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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The following table sets forth, by level within the fair value hierarchy, the Company’s financial assets and liabilities (as applicable) that were accounted for at fair value on a recurring basis as of September 30, 2020 and 2019. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The fair value presentation for over-the-counter swaps combines gas and oil swaps because a significant number of the counterparties enter into both gas and oil swap agreements with the Company. 
 At Fair Value as of September 30, 2020
Recurring Fair Value MeasuresLevel 1Level 2Level 3Netting
Adjustments(1)
Total(1)
 (Dollars in thousands)
Assets:
Cash Equivalents — Money Market Mutual Funds$12,285 $— $— $— $12,285 
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil— 36,418 — (26,400)10,018 
Over the Counter No Cost Collars — Gas— — — (720)(720)
Foreign Currency Contracts— 259 — (338)(79)
Other Investments:
Balanced Equity Mutual Fund39,618 — — — 39,618 
Fixed Income Mutual Fund72,253 — — — 72,253 
Common Stock — Financial Services Industry639 — — — 639 
Total$124,795 $36,677 $— $(27,458)$134,014 
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil$— $61,280 $— $(26,400)$34,880 
Over the Counter No Cost Collars — Gas— 8,171 — (720)7,451 
Foreign Currency Contracts— 1,976 — (338)1,638 
Total$— $71,427 $— $(27,458)$43,969 
Total Net Assets/(Liabilities)$124,795 $(34,750)$— $— $90,045 
 At Fair Value as of September 30, 2019
Recurring Fair Value MeasuresLevel 1Level 2Level 3Netting
Adjustments(1)
Total(1)
 (Dollars in thousands)
Assets:
Cash Equivalents — Money Market Mutual Funds$10,521 $— $— $— $10,521 
Derivative Financial Instruments:
Commodity Futures Contracts — Gas2,055 — — (2,055)— 
Over the Counter Swaps — Gas and Oil— 52,076 — (1,483)50,593 
Foreign Currency Contracts— — (2,052)(2,047)
Other Investments:
Balanced Equity Mutual Fund40,660 — — — 40,660 
Fixed Income Mutual Fund62,339 — — — 62,339 
Common Stock — Financial Services Industry844 — — — 844 
Hedging Collateral Deposits6,832 — — — 6,832 
Total$123,251 $52,081 $— $(5,590)$169,742 
Liabilities:
Derivative Financial Instruments:
Commodity Futures Contracts — Gas$7,149 $— $— $(2,055)$5,094 
Over the Counter Swaps — Gas and Oil— 1,671 — (1,483)188 
Foreign Currency Contracts— 2,344 — (2,052)292 
Total$7,149 $4,015 $— $(5,590)$5,574 
Total Net Assets/(Liabilities)$116,102 $48,066 $— $— $164,168 
(1)Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.