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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Short-term investments:
Total short-term investments	$ 93,600	$ 117,101
Nonrecurring fair value measurements
Total	239,145	205,943
Liabilities
Contingent consideration	0	1,272
Geothermal Investments
Liabilities
Equity securities measured at cost	25,200
Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	14,597	14,301
Nonrecurring fair value measurements
Total	236,715	195,236
Liabilities
Contingent consideration	9,455	4,022
Recurring Fair Value Measurements | ADNOC Drilling
Long-term investments:
Equity securities, investment	174,758	147,370
Recurring Fair Value Measurements | Galileo Technologies
Long-term investments:
Debt securities, investment	35,434	33,000
Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term investments:
Equity securities, investment	9,920
Recurring Fair Value Measurements | Geothermal Investments
Long-term investments:
Debt securities, investment	2,006
Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment		565
Nonrecurring Fair Value Measurements
Nonrecurring fair value measurements
Other equity securities	2,430
Total	2,430	10,707
Liabilities
Equity securities measured at cost		600
Nonrecurring Fair Value Measurements | Geothermal Investments
Long-term investments:
Equity securities, investment		23,100
Nonrecurring fair value measurements
Geothermal equity securities		10,707
Liabilities
Equity securities measured at cost		12,400
Nonrecurring Fair Value Measurements | Other
Long-term investments:
Equity securities, investment	3,000
Liabilities
Equity securities measured at cost	600
Level 1
Short-term investments:
Total short-term investments	44,836	18,837
Nonrecurring fair value measurements
Total	199,275	161,671
Level 1 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	14,597	14,301
Nonrecurring fair value measurements
Total	199,275	161,671
Liabilities
Contingent consideration	0	0
Level 1 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term investments:
Equity securities, investment	174,758	147,370
Level 1 | Recurring Fair Value Measurements | Galileo Technologies
Long-term investments:
Debt securities, investment	0	0
Level 1 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term investments:
Equity securities, investment	9,920
Level 1 | Recurring Fair Value Measurements | Geothermal Investments
Long-term investments:
Debt securities, investment	0
Level 1 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment		0
Level 1 | Nonrecurring Fair Value Measurements
Nonrecurring fair value measurements
Other equity securities	0
Total	0	0
Level 1 | Nonrecurring Fair Value Measurements | Geothermal Investments
Nonrecurring fair value measurements
Geothermal equity securities		0
Level 2
Short-term investments:
Total short-term investments	48,764	98,264
Nonrecurring fair value measurements
Total	0	0
Level 2 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	0	0
Nonrecurring fair value measurements
Total	0	0
Liabilities
Contingent consideration	0	0
Level 2 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term investments:
Equity securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Galileo Technologies
Long-term investments:
Debt securities, investment	0	0
Level 2 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term investments:
Equity securities, investment	0
Level 2 | Recurring Fair Value Measurements | Geothermal Investments
Long-term investments:
Debt securities, investment	0
Level 2 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment		0
Level 2 | Nonrecurring Fair Value Measurements
Nonrecurring fair value measurements
Other equity securities	0
Total	0	0
Level 2 | Nonrecurring Fair Value Measurements | Geothermal Investments
Nonrecurring fair value measurements
Geothermal equity securities		0
Level 3
Short-term investments:
Total short-term investments	0	0
Nonrecurring fair value measurements
Total	39,870	44,272
Level 3 | Recurring Fair Value Measurements
Long-term investments:
Non-qualified supplemental savings plan	0	0
Nonrecurring fair value measurements
Total	37,440	33,565
Liabilities
Contingent consideration	9,455	4,022
Level 3 | Recurring Fair Value Measurements | ADNOC Drilling
Long-term investments:
Equity securities, investment	0	0
Level 3 | Recurring Fair Value Measurements | Galileo Technologies
Long-term investments:
Debt securities, investment	35,434	33,000
Level 3 | Recurring Fair Value Measurements | Tamboran Resources Limited
Long-term investments:
Equity securities, investment	0
Level 3 | Recurring Fair Value Measurements | Geothermal Investments
Long-term investments:
Debt securities, investment	2,006
Level 3 | Recurring Fair Value Measurements | Other
Long-term investments:
Debt securities, investment		565
Level 3 | Nonrecurring Fair Value Measurements
Nonrecurring fair value measurements
Geothermal equity securities	2,400
Other equity securities	2,430
Total	2,430	10,707
Level 3 | Nonrecurring Fair Value Measurements | Geothermal Investments
Nonrecurring fair value measurements
Geothermal equity securities		10,707
Corporate debt securities
Short-term investments:
Total short-term investments	48,764	98,264
Corporate debt securities | Level 1
Short-term investments:
Total short-term investments	0	0
Corporate debt securities | Level 2
Short-term investments:
Total short-term investments	48,764	98,264
Corporate debt securities | Level 3
Short-term investments:
Total short-term investments	0	0
U.S. government and federal agency securities
Short-term investments:
Total short-term investments	44,836	18,837
U.S. government and federal agency securities | Level 1
Short-term investments:
Total short-term investments	44,836	18,837
U.S. government and federal agency securities | Level 2
Short-term investments:
Total short-term investments	0	0
U.S. government and federal agency securities | Level 3
Short-term investments:
Total short-term investments	$ 0	$ 0

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