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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 22, 2020 | Feb. 19, 2020 | Sep. 30, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | $ 1,149,903 |  |  | $ 1,114,131
Less: current portion, outstanding balance | (9,235) |  |  | (10,525)
Long-term debt, outstanding balance | 1,140,668 |  |  | 1,103,606
Original Issuer Premium | 375 |  |  | 867
Less: current portion, original issuer premium, current | 0 |  |  | 0
Long-term debt, original issuer premium, noncurrent | 375 |  |  | 867
Capitalized Fees & Expenses | (17,678) |  |  | (10,724)
Balance Sheet | 1,132,600 |  |  | 1,104,274
Less: current portion, balance sheet | (9,235) |  |  | (10,525)
Long-term debt, balance sheet | 1,123,365 |  |  | 1,093,749
Senior notes due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | 1,000,000 | $ 150,000 |  | 0
Original Issuer Premium | 375 |  |  | 0
Capitalized Fees & Expenses | (14,877) |  |  | 0
Balance Sheet | $ 985,498 |  |  | $ 0
Coupon Interest Rate | 5.75% | 5.75% | 5.75% | 0.00%
Senior notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | $ 0 |  |  | $ 1,000,000
Original Issuer Premium | 0 |  |  | 867
Capitalized Fees & Expenses | 0 |  |  | (9,175)
Balance Sheet | $ 0 |  |  | $ 991,692
Coupon Interest Rate | 5.25% |  | 5.25% | 5.25%
Revolver due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | $ 104,181 |  |  | $ 50,000
Original Issuer Premium | 0 |  |  | 0
Capitalized Fees & Expenses | (2,544) |  |  | (1,243)
Balance Sheet | 101,637 |  |  | 48,757
Capital lease - real estate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | 11,564 |  |  | 4,388
Original Issuer Premium | 0 |  |  | 0
Capitalized Fees & Expenses | (36) |  |  | (55)
Balance Sheet | $ 11,528 |  |  | $ 4,333
Coupon Interest Rate | 5.00% |  |  | 5.00%
Non US lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | $ 0 |  |  | $ 17,576
Original Issuer Premium | 0 |  |  | 0
Capitalized Fees & Expenses | (33) |  |  | (45)
Balance Sheet | (33) |  |  | 17,531
Non US term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | 30,736 |  |  | 36,977
Original Issuer Premium | 0 |  |  | 0
Capitalized Fees & Expenses | (172) |  |  | (188)
Balance Sheet | 30,564 |  |  | 36,789
Other long term debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding Balance | 3,422 |  |  | 5,190
Original Issuer Premium | 0 |  |  | 0
Capitalized Fees & Expenses | (16) |  |  | (18)
Balance Sheet | $ 3,406 |  |  | $ 5,172

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