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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
 3 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
NOTE 12 FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS
We have certain assets and liabilities that are required to be measured and disclosed at fair value. Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date.  We use the fair value hierarchy established in ASC 820-10 to measure fair value to prioritize the inputs:
•Level 1 — Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
•Level 2 — Observable inputs, other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
•Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.  This includes pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.
The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
Recurring Fair Value Measurements
The following tables summarize our financial assets and liabilities measured at fair value on a recurring basis and indicate the level in the fair value hierarchy in which we classify the fair value measurement.
December 31, 2021
(in thousands)Fair ValueLevel 1Level 2Level 3
Assets    
Short-term investments: 
Corporate debt securities$203,401 $— $203,401 $— 
U.S. government and federal agency securities3,667 3,667 — — 
Total short-term investments207,068 3,667 203,401 — 
Investments:
Non-qualified supplemental savings plan19,455 19,455 — — 
Equity and debt securities17,502 14,002 — 3,500 
Equity investment in ADNOC Drilling147,786 147,786 — — 
Total investments184,743 181,243 — 3,500 
Liabilities
Contingent consideration$3,096 $— $— $3,096 
September 30, 2021
(in thousands)Fair ValueLevel 1Level 2Level 3
Assets    
Short-term investments:    
Corporate debt securities$192,950 $— $192,950 $— 
U.S. government and federal agency securities5,750 5,750 — — 
Total short-term investments198,700 5,750 192,950 — 
Investments:
Non-qualified supplemental savings plan18,221 18,221 — — 
Equity and debt securities14,358 13,858 — 500 
Cornerstone investment in ADNOC Drilling100,000 100,000 — — 
Total investments132,579 132,079 — 500 
Liabilities
Contingent consideration$2,996 $— $— $2,996 
Short-term investments include securities classified as trading securities. Both realized and unrealized gains and losses on trading securities are included in other income (expense) in the Unaudited Condensed Consolidated Statements of Operations. The securities are recorded at fair value. Level 1 inputs include U.S. agency issued debt securities with active markets and money market funds. For these items, quoted current market prices are readily available. Level 2 inputs included corporate bonds measured using broker quotations that utilize observable market inputs.
Our long-term investments include debt and equity securities and assets held in a Non-Qualified Supplemental Savings Plan ("Savings Plan"). Our assets that we hold in the Savings Plan are comprised of mutual funds that are measured using Level 1 inputs. Additionally we hold equity securities in Schlumberger, Ltd., which is classified as Level 1 and based on the quoted stock price. Our long-term debt securities are classified as available-for-sale and considered a Level 3 input based on the absence of market activity.
During September 2021, the Company made a $100.0 million cornerstone investment in ADNOC Drilling in advance of its announced IPO, representing 159.7 million shares of ADNOC Drilling, equivalent to a one percent ownership stake and subject to a three-year lockup period. ADNOC Drilling's IPO was completed on October 3, 2021 and its shares are listed and traded on the Abu Dhabi Securities Exchange (ADX). Our investment is classified as a long-term equity investment within Investments in our Unaudited Condensed Consolidated Balance Sheets. We have applied the guidance in Topic 820, Fair Value Measurement, in the initial accounting of the transaction and the subsequent revaluation of the investment balance, concluding that a contractual restriction on the sale of an equity security that is publicly traded is not considered in measuring fair value. During the three months ended December 31, 2021, we recognized a gain of $47.8 million in our Unaudited Condensed Consolidated Statement of Operations. As of December 31, 2021, this investment is classified as a Level 1 investment and based on the quoted stock price on the Abu Dhabi Securities Exchange, without applying a discount factor.
Our financial liabilities measured using Level 3 unobservable inputs primarily consist of potential earnout payments associated with our business acquisitions in fiscal year 2019. The contingent considerations are recorded in Accrued Liabilities and Other Noncurrent Liabilities in the Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the milestone achievement. The following table reconciles changes in the fair value for the periods presented below:
Three Months Ended
December 31,
(in thousands)20212020
Liabilities at beginning of period$2,996 $9,123 
Additions500 — 
Total gains or losses:
Included in earnings(150)100 
Settlements 1
(250)(250)
Liabilities at end of period$3,096 $8,973 
(1)Settlements represent earnout payments that have been paid or earned during the period.
Nonrecurring Fair Value Measurements
We have certain assets that are subject to measurement at fair value on a nonrecurring basis. For these nonfinancial assets, measurement at fair value in periods subsequent to their initial recognition is applicable if they are determined to be impaired. These assets generally include assets held-for-sale, property, plant and equipment, goodwill, intangible assets, and operating lease right-of-use assets. If measured at fair value in the Unaudited Condensed Consolidated Balance Sheets, these would generally be classified within Level 2 or 3 of the fair value hierarchy. Further details on any changes in valuation of these assets is provided in their respective footnotes.
We also hold various other equity securities without readily determinable fair values that are classified as Level 3. These equity securities are measured at cost, less any impairments on a nonrecurring basis. As of December 31, 2021, the carrying value of these assets were equal to their fair value as no impairments have been taken to date. The following tables summarize our financial assets measured at fair value on a non-recurring basis:
December 31, 2021
(in thousands)Fair ValueLevel 1Level 2Level 3
Investments:    
Equity securities $8,881 $— $— $8,881 
September 30, 2021
(in thousands)Fair ValueLevel 1Level 2Level 3
Investments:    
Equity securities $2,865 $— $— $2,865 
As of December 31, 2021 and September 30, 2021 the aggregate balance of our debt and equity security investments in geothermal was $11.8 million and $2.7 million, respectively. These investments include assets measured on both a recurring and nonrecurring basis.
The following table reconciles changes in the fair value for our equity securities without readily determinable fair values that are classified as Level 3 for the periods presented below:
Three Months Ended
December 31,
(in thousands)20212020
Assets at beginning of period$2,865 $— 
Purchases6,016 1,000 
Assets at end of period$8,881 $1,000 
Other Financial Instruments

The carrying amount of cash and cash equivalents and restricted cash approximates fair value due to the short-term nature of these items. The majority of cash equivalents are invested in highly liquid money-market mutual funds invested primarily in direct or indirect obligations of the U.S. Government and in federally insured deposit accounts. The carrying value of accounts receivables, other current and noncurrent assets, accounts payable, accrued liabilities and other liabilities approximated fair value at December 31, 2021 and September 30, 2021.
The following information presents the supplemental fair value information about long-term fixed-rate debt at December 31, 2021 and September 30, 2021:
(in millions)
December 31, 2021 1
September 30, 2021
Current portion of long-term debt
Carrying value$— $483.5 
Fair value— 541.6 
Long-term debt, net
Carrying value542.2 542.0 
Fair value542.5 554.3 
(1)On October 27, 2021 we redeemed the outstanding 2025 Notes. See Note 6—Debt to our Consolidated Financial Statements
The fair values of the current and long-term fixed-rate debt is based on broker quotes as of December 31, 2021 and September 30, 2021.  The notes are classified within Level 2 of the fair value hierarchy as they are not actively traded in markets.