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LONG-TERM DEBT - Summary of long-term debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding Balance | $ 1,060,506 | $ 1,064,422
less: Current portion | (12,486) | (9,922)
Long-term debt | 1,048,020 | 1,054,500
Original Issuer Premium | 315 | 363
less: Current portion | 0 | 0
Non-current | 315 | 363
Capitalized Fees & Expenses | (15,138) | (17,821)
Capitalized Fees & Expenses, Current | 0 | 0
Capitalized Fees & Expenses, Noncurrent | (15,138) | (17,821)
Balance Sheet | 1,045,683 | 1,046,964
less: Current portion | (12,486) | (9,922)
Long-term debt | 1,033,197 | 1,037,042
Senior Notes Due 2028 |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 1,000,000 | 1,000,000
Original Issuer Premium | 315 | 363
Capitalized Fees & Expenses | (13,293) | (15,376)
Balance Sheet | $ 987,022 | $ 984,987
Coupon Interest Rate | 5.75% | 5.75%
Revolver Due 2025 |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | $ 13,483 | $ 12,858
Original Issuer Premium | 0 | 0
Capitalized Fees & Expenses | (1,718) | (2,209)
Balance Sheet | 11,765 | 10,649
Finance Lease - Real Estate |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 14,594 | 17,218
Original Issuer Premium | 0 | 0
Capitalized Fees & Expenses | (4) | (30)
Balance Sheet | 14,590 | 17,188
Non U.S. Lines of Credit |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 3,012 | 0
Original Issuer Premium | 0 | 0
Capitalized Fees & Expenses | (17) | (30)
Balance Sheet | 2,995 | (30)
Non U.S. Term Loans |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 25,684 | 31,086
Original Issuer Premium | 0 | 0
Capitalized Fees & Expenses | (91) | (160)
Balance Sheet | 25,593 | 30,926
Other Long Term Debt |  |
Debt Instrument [Line Items] |  |
Outstanding Balance | 3,733 | 3,260
Original Issuer Premium | 0 | 0
Capitalized Fees & Expenses | (15) | (16)
Balance Sheet | $ 3,718 | $ 3,244

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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