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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Debt Instrument [Line Items]    
Outstanding Balance $ 1,024,178 $ 952,856
less: Current portion, Outstanding Balance (16,757) (22,644)
Long-term debt, Outstanding Balance 1,007,421 930,212
Original Issuer Discount (1,312) (2,695)
less: Current portion, Original Issuer Discount 0 0
Long-term debt, Original Issuer Discount (1,312) (2,695)
Capitalized Fees & Expenses (12,533) (13,603)
Balance Sheet 1,010,333 936,558
less: Current portion 16,757 22,644
Long-term debt 993,576 913,914
Senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 725,000 725,000
Original Issuer Discount (1,312) (1,447)
Capitalized Fees & Expenses (9,047) (9,799)
Balance Sheet $ 714,641 $ 713,754
Coupon Interest Rate 5.25% 5.25%
Revolver due 2019 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 176,000 $ 0
Original Issuer Discount 0 0
Capitalized Fees & Expenses (2,179) (2,425)
Balance Sheet 173,821 (2,425)
Convert. debt due 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 0 100,000
Original Issuer Discount 0 (1,248)
Capitalized Fees & Expenses 0 (148)
Balance Sheet 0 $ 98,604
Coupon Interest Rate   4.00%
Real estate mortgages [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 36,519 $ 37,861
Original Issuer Discount 0 0
Capitalized Fees & Expenses (507) (595)
Balance Sheet 36,012 37,266
ESOP Loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 42,290 34,387
Original Issuer Discount 0 0
Capitalized Fees & Expenses (345) (237)
Balance Sheet 41,945 34,150
Capital lease - real estate [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 5,885 6,447
Original Issuer Discount 0 0
Capitalized Fees & Expenses (118) (131)
Balance Sheet $ 5,767 $ 6,316
Coupon Interest Rate 5.00% 5.00%
Non U.S. lines of credit [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 1,731 $ 11,462
Original Issuer Discount 0 0
Capitalized Fees & Expenses (72) (1)
Balance Sheet 1,659 11,461
Non U.S. term loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 33,056 33,669
Original Issuer Discount 0 0
Capitalized Fees & Expenses (243) (247)
Balance Sheet 32,813 33,422
Other long term debt [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 3,697 4,030
Original Issuer Discount 0 0
Capitalized Fees & Expenses (22) (20)
Balance Sheet $ 3,675 $ 4,010