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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Supplemental Fair Value Information about Long-Term Fixed-Rate Debt (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | $ 2,057,084,000 | $ 1,782,182,000
Due December 1, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 347,675,000 | 347,093,000
Due December 1, 2029 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 346,602,000 | 346,297,000
Due September 29, 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 546,336,000 | 545,738,000
Due December 1, 2034 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 543,197,000 | 543,054,000
Due January 15, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 199,020,000 |
2023 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 35,465,000 |
2024 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, carrying value | 38,789,000 |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 1 | Due December 1, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 1 | Due December 1, 2029 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 1 | Due September 29, 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 1 | Due December 1, 2034 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 1 | Due January 15, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 1 | 2023 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 1 | 2024 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 1,927,001,000 | 1,702,850,000
Level 2 | Due December 1, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 352,261,000 | 350,700,000
Level 2 | Due December 1, 2029 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 348,688,000 | 345,100,000
Level 2 | Due September 29, 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 486,343,000 | 471,350,000
Level 2 | Due December 1, 2034 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 538,417,000 | 535,700,000
Level 2 | Due January 15, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 201,292,000 |
Level 2 | 2023 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 2 | 2024 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 74,254,000 | 0
Level 3 | Due December 1, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 3 | Due December 1, 2029 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 3 | Due September 29, 2031 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | 0
Level 3 | Due December 1, 2034 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 | $ 0
Level 3 | Due January 15, 2027 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 0 |
Level 3 | 2023 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | 35,465,000 |
Level 3 | 2024 Oman Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, net, fair value | $ 38,789,000 |

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