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LONG-TERM DEBT - Summary of Interest Expense Incurred (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |
Cash interest, capitalized interest | $ (16) | $ (18) | $ (109) | $ (18)
Cash interest | 16,121 | 15,996 | 46,936 | 47,200
Amort. Debt Discount | 11 | 68 | 123 | 202
Amort. Debt Issuance Costs & Other Fees | 593 | 1,224 | 2,748 | 3,932
Total Interest Expense | $ 16,725 | 17,288 | $ 49,807 | 51,334
Senior notes due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective Interest Rate | 5.80% |  | 5.90% |
Cash interest, including amounts capitalized | $ 12,219 | 0 | $ 17,785 | 0
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 277 | 0 | 412 | 0
Total Interest Expense | $ 12,496 | $ 0 | $ 18,197 | $ 0
Senior notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective Interest Rate | 6.20% | 5.70% | 5.70% | 5.70%
Cash interest, including amounts capitalized | $ 1,960 | $ 13,125 | $ 23,125 | $ 39,375
Amort. Debt Discount | 11 | 68 | 123 | 202
Amort. Debt Issuance Costs & Other Fees | 155 | 950 | 1,734 | 2,852
Total Interest Expense | 2,126 | 14,143 | 24,982 | 42,429
Revolver due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash interest, including amounts capitalized | 1,597 | 2,282 | 4,798 | 4,846
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 134 | 220 | 531 | 761
Total Interest Expense | 1,731 | $ 2,502 | 5,329 | $ 5,607
ESOP Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective Interest Rate |  | 7.20% |  | 6.60%
Cash interest, including amounts capitalized | 0 | $ 0 | 0 | $ 937
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 0 | 0 | 0 | 186
Total Interest Expense | $ 0 | $ 0 | $ 0 | $ 1,123
Capital lease - real estate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Effective Interest Rate | 6.30% | 5.60% | 6.10% | 5.50%
Cash interest, including amounts capitalized | $ 33 | $ 78 | $ 146 | $ 294
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 6 | 7 | 19 | 19
Total Interest Expense | 39 | 85 | 165 | 313
Non US lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash interest, including amounts capitalized | 4 | 4 | 11 | 15
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | (1) | 3 | 11 | 11
Total Interest Expense | 3 | 7 | 22 | 26
Non US term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash interest, including amounts capitalized | 222 | 376 | 786 | 1,273
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 21 | 44 | 40 | 97
Total Interest Expense | 243 | 420 | 826 | 1,370
Other long term debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash interest, including amounts capitalized | 102 | 149 | 394 | 478
Amort. Debt Discount | 0 | 0 | 0 | 0
Amort. Debt Issuance Costs & Other Fees | 1 | 0 | 1 | 6
Total Interest Expense | $ 103 | $ 149 | $ 395 | $ 484

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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=119993939&loc=d3e28541-108399 Reference 2: 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=121586364&loc=d3e3602-108585 Reference 3: 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=120395209&loc=SL114868664-224227 + Details
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