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NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate |  | 5.66% |
Cash Interest | $ 62,673 | $ 60,349 | $ 47,002
Amort. Debt Discount | 270 | 270 | 1,518
Amort. Deferred Cost & Other Fees | 5,123 | 4,949 | 2,993
Total Interest Expense | $ 68,066 | 65,568 | $ 51,513
Senior note due 2022 [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate | 5.66% |  | 5.55%
Cash Interest | $ 52,500 | 52,500 | $ 38,063
Amort. Debt Discount | 270 | 270 | 270
Amort. Deferred Cost & Other Fees | 3,803 | 3,803 | 1,857
Total Interest Expense | 56,573 | $ 56,573 | 40,190
Revolver due 2018 [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Cash Interest | 6,998 |  | 4,951
Amort. Debt Discount | 0 |  | 0
Amort. Deferred Cost & Other Fees | 980 |  | 567
Total Interest Expense | $ 7,978 |  | $ 5,518
Convert. debt due 2017 [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate |  |  | 8.90%
Cash Interest |  |  | $ 1,167
Amort. Debt Discount |  |  | 1,248
Amort. Deferred Cost & Other Fees |  |  | 148
Total Interest Expense |  |  | $ 2,563
Real estate mortgages [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate |  | 3.30% | 2.60%
Cash Interest |  | $ 349 | $ 582
Amort. Debt Discount |  | 0 | 0
Amort. Deferred Cost & Other Fees |  | 320 | 58
Total Interest Expense |  | $ 669 | $ 640
ESOP Loans [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate | 6.30% | 6.30% | 4.20%
Cash Interest | $ 937 | $ 1,802 | $ 1,557
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 186 | 124 | 133
Total Interest Expense | 1,123 | 1,926 | $ 1,690
Capital lease - real estate [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Effective Interest Rate |  |  | 5.50%
Cash Interest | 372 | 581 | $ 296
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 25 | 25 | 25
Total Interest Expense | 397 | 606 | 321
Non U.S. lines of credit [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Cash Interest | 19 | 34 | 76
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 15 | 15 | 128
Total Interest Expense | 34 | 49 | 204
Non U.S. term loans [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Cash Interest | 1,592 | 1,420 | 860
Amort. Debt Discount | 0 | 0 | 0
Amort. Deferred Cost & Other Fees | 109 | 90 | 67
Total Interest Expense | 1,701 | 1,510 | 927
Other long term debt [Member] |  |  |
NOTES PAYABLE, CAPITALIZED LEASES AND LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items] |  |  |
Cash Interest | 640 | 494 | 245
Amort. Debt Discount |  | 0 | 0
Amort. Deferred Cost & Other Fees | 5 | 7 | 10
Total Interest Expense | $ 645 | $ 501 | $ 255

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