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LONG-TERM DEBT - Summary of interest expense incurred (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |
Cash Interest | $ 60,535 | $ 62,883 | $ 62,919
Amort. Debt Discount | (48) | 122 | 270
Amort. Deferred Cost & Other Fees | 2,688 | 3,539 | 5,123
Capitalized interest | (31) | (128) | (139)
Total Interest Expense | $ 63,175 | $ 66,544 | $ 68,312
Senior Notes Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Effective Interest Rate | 5.95% | 5.90% |
Cash Interest | $ 57,500 | $ 32,511 |
Amort. Debt Discount | (48) | 0 |
Amort. Deferred Cost & Other Fees | 2,084 | 1,072 |
Total Interest Expense | 59,536 | $ 33,583 |
Senior Notes Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Effective Interest Rate |  | 5.67% | 5.66%
Cash Interest |  | $ 22,816 | $ 52,500
Amort. Debt Discount |  | 122 | 270
Amort. Deferred Cost & Other Fees |  | 1,735 | 3,803
Total Interest Expense |  | 24,673 | 56,573
Revolver Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Cash Interest | 1,078 | 5,866 | 6,998
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 491 | 635 | 980
Total Interest Expense | $ 1,569 | $ 6,501 | $ 7,978
Finance Lease - Real Estate |  |  |
Debt Instrument [Line Items] |  |  |
Effective Interest Rate | 5.65% | 4.45% | 6.70%
Cash Interest | $ 875 | $ 386 | $ 372
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 25 | 25 | 25
Total Interest Expense | 900 | 411 | 397
Non U.S. Lines of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Cash Interest | 15 | 12 | 19
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 15 | 15 | 15
Total Interest Expense | 30 | 27 | 34
Non U.S. Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Cash Interest | 655 | 975 | 1,592
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 71 | 55 | 109
Total Interest Expense | 726 | 1,030 | 1,701
Other Long Term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Cash Interest | 443 | 445 | 640
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 2 | 2 | 5
Total Interest Expense | $ 445 | $ 447 | $ 645
ESOP Loans |  |  |
Debt Instrument [Line Items] |  |  |
Effective Interest Rate |  |  | 6.30%
Cash Interest |  |  | $ 937
Amort. Debt Discount |  |  | 0
Amort. Deferred Cost & Other Fees |  |  | 186
Total Interest Expense |  |  | $ 1,123

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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