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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Debt Instrument [Line Items]    
Outstanding Balance $ 979,662 $ 952,856
less: Current portion, Outstanding Balance (26,347) (22,644)
Long-term debt, Outstanding Balance 953,315 930,212
Original Issuer Discount (1,569) (2,695)
less: Current portion, Original Issuer Discount 0 0
Long-term debt, Original Issuer Discount (1,569) (2,695)
Balance Sheet 965,020 936,558
less: Current portion 26,347 22,644
Long-term debt 938,673 913,914
Capitalized Fees & Expenses (13,073) (13,603)
Senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 725,000 725,000
Original Issuer Discount (1,379) (1,447)
Balance Sheet 714,112 713,754
Capitalized Fees & Expenses $ (9,509) $ (9,799)
Coupon Interest Rate 5.25% 5.25%
Revolver due 2019 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 23,000 $ 0
Original Issuer Discount 0 0
Balance Sheet 20,740 (2,425)
Capitalized Fees & Expenses (2,260) (2,425)
Convert. debt due 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 100,000 100,000
Original Issuer Discount (190) (1,248)
Balance Sheet 99,773 98,604
Capitalized Fees & Expenses $ (37) $ (148)
Coupon Interest Rate 4.00% 4.00%
Real estate mortgages [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 37,190 $ 37,861
Original Issuer Discount 0 0
Balance Sheet 36,665 37,266
Capitalized Fees & Expenses (525) (595)
ESOP Loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 42,945 34,387
Original Issuer Discount 0 0
Balance Sheet 42,644 34,150
Capitalized Fees & Expenses (301) (237)
Capital lease - real estate [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 6,169 6,447
Original Issuer Discount 0 0
Balance Sheet 6,045 6,316
Capitalized Fees & Expenses $ (124) $ (131)
Coupon Interest Rate 5.00% 5.00%
Non U.S. lines of credit [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 11,910 $ 11,462
Original Issuer Discount 0 0
Balance Sheet 11,878 11,461
Capitalized Fees & Expenses (32) (1)
Non U.S. term loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 29,676 33,669
Original Issuer Discount 0 0
Balance Sheet 29,414 33,422
Capitalized Fees & Expenses (262) (247)
Other long term debt [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 3,772 4,030
Original Issuer Discount 0 0
Balance Sheet 3,749 4,010
Capitalized Fees & Expenses $ (23) $ (20)