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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Oct. 02, 2017
May 18, 2016
Feb. 27, 2014
Debt Instrument [Line Items]          
Outstanding Balance $ 1,181,426 $ 1,134,692      
less: Current portion, Outstanding Balance (10,884) (13,011)      
Long-term debt, Outstanding Balance 1,170,542 1,121,681      
Debt Instrument, Unamortized Premium 955 1,220      
Debt Instrument, Unamortized Premium, Current 0 0      
Debt Instrument, Unamortized Premium, Noncurrent 955 1,220      
Capitalized Fees & Expenses (11,876) (14,830)      
Long-term debt 1,170,505 1,121,082      
less: Current portion (10,884) (13,011)      
Long-term debt 1,159,621 1,108,071      
Senior notes due 2022 [Member]          
Debt Instrument [Line Items]          
Outstanding Balance 1,000,000 1,000,000      
Debt Instrument, Unamortized Premium 955 1,220      
Capitalized Fees & Expenses (10,116) (12,968)      
Long-term debt $ 990,839 $ 988,252      
Coupon Interest Rate 5.25% 5.25% 5.25% 5.25% 5.25%
Revolver due 2021 [Member]          
Debt Instrument [Line Items]          
Outstanding Balance $ 122,806 $ 25,000      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses (1,463) (1,413)      
Long-term debt 121,343 23,587      
ESOP Loans [Member]          
Debt Instrument [Line Items]          
Outstanding Balance 0 34,694      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses 0 (186)      
Long-term debt 0 34,508      
Capital lease - real estate [Member]          
Debt Instrument [Line Items]          
Outstanding Balance 5,185 7,503      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses (61) (80)      
Long-term debt $ 5,124 $ 7,423      
Coupon Interest Rate 5.00% 5.00%      
Non U.S. lines of credit [Member]          
Debt Instrument [Line Items]          
Outstanding Balance $ 8,443 $ 7,951      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses (5) (16)      
Long-term debt 8,438 7,935      
Non U.S. term loans [Member]          
Debt Instrument [Line Items]          
Outstanding Balance 39,617 53,533      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses (213) (148)      
Long-term debt 39,404 53,385      
Other long term debt [Member]          
Debt Instrument [Line Items]          
Outstanding Balance 5,375 6,011      
Debt Instrument, Unamortized Premium 0 0      
Capitalized Fees & Expenses (18) (19)      
Long-term debt $ 5,357 $ 5,992