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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]    
Outstanding Balance $ 917,191 $ 861,199
less: Current portion, Outstanding Balance (15,189) (16,593)
Long-term debt, Outstanding Balance 902,002 844,606
Original Issuer Discount (4,546) (5,594)
less: Current portion, Original Issuer Discount 0 0
Long-term debt, Original Issuer Discount (4,546) (5,594)
Balance Sheet 901,217 843,569
less: Current portion (15,189) (16,593)
Long-term debt 886,028 826,976
Capitalized Fees & Expenses (11,428) (12,036)
Senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 600,000 600,000
Original Issuer Discount 0 0
Balance Sheet 592,058 591,736
Capitalized Fees & Expenses $ (7,942) $ (8,264)
Coupon Interest Rate 5.25% 5.25%
Revolver due 2019 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 95,000 $ 35,000
Original Issuer Discount 0 0
Balance Sheet 93,086 32,951
Capitalized Fees & Expenses (1,914) (2,049)
Convert. debt due 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 100,000 100,000
Original Issuer Discount (4,546) (5,594)
Balance Sheet 94,974 93,835
Capitalized Fees & Expenses $ (480) $ (571)
Coupon Interest Rate 4.00% 4.00%
Real estate mortgages [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 31,742 $ 32,280
Original Issuer Discount 0 0
Balance Sheet 31,284 31,810
Capitalized Fees & Expenses (458) (470)
ESOP Loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 36,194 36,744
Original Issuer Discount 0 0
Balance Sheet 35,987 36,520
Capitalized Fees & Expenses (207) (224)
Capital lease - real estate [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 7,261 7,524
Original Issuer Discount 0 0
Balance Sheet 7,111 7,368
Capitalized Fees & Expenses $ (150) $ (156)
Coupon Interest Rate 5.00% 5.00%
Non U.S. lines of credit [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 5,553 $ 8,934
Original Issuer Discount 0 0
Balance Sheet 5,541 8,931
Capitalized Fees & Expenses (12) (3)
Non U.S. term loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 37,801 39,142
Original Issuer Discount 0 0
Balance Sheet 37,536 38,843
Capitalized Fees & Expenses (265) (299)
Other long term debt [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 3,640 1,575
Original Issuer Discount 0 0
Balance Sheet 3,640 1,575
Capitalized Fees & Expenses $ 0 $ 0