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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]    
Outstanding Balance $ 859,522 $ 822,571
less: Current portion, Outstanding Balance (11,771) (7,886)
Long-term debt, Outstanding Balance 847,751 814,685
Original Issuer Discount (6,628) (9,584)
less: Current portion, Original Issuer Discount 0 0
Long-term debt, Original Issuer Discount (6,628) (9,584)
Balance Sheet 840,470 799,187
less: Current portion (11,771) (7,886)
Long-term debt 828,699 791,301
Capitalized Fees & Expenses (12,424) (13,800)
Senior notes due 2022 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 600,000 600,000
Original Issuer Discount 0 0
Balance Sheet 591,413 590,447
Capitalized Fees & Expenses $ (8,587) $ (9,553)
Coupon Interest Rate 5.25% 5.25%
Revolver due 2019 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 65,000 $ 25,000
Original Issuer Discount 0 0
Balance Sheet 62,838 22,991
Capitalized Fees & Expenses (2,162) (2,009)
Convert. debt due 2017 [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 100,000 100,000
Original Issuer Discount (6,628) (9,584)
Balance Sheet 92,670 89,382
Capitalized Fees & Expenses $ (702) $ (1,034)
Coupon Interest Rate 4.00% 4.00%
Real estate mortgages [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 15,744 $ 16,388
Original Issuer Discount 0 0
Balance Sheet 15,276 15,812
Capitalized Fees & Expenses (468) (576)
ESOP Loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 37,295 38,946
Original Issuer Discount 0 0
Balance Sheet 37,056 38,684
Capitalized Fees & Expenses (239) (262)
Capital lease - real estate [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 7,785 8,551
Original Issuer Discount 0 0
Balance Sheet 7,623 8,370
Capitalized Fees & Expenses $ (162) $ (181)
Coupon Interest Rate 5.00% 5.00%
Non U.S. lines of credit [Member]    
Debt Instrument [Line Items]    
Outstanding Balance $ 7,116 $ 3,306
Original Issuer Discount 0 0
Balance Sheet 7,108 3,306
Capitalized Fees & Expenses (8) 0
Non U.S. term loans [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 24,879 28,470
Original Issuer Discount 0 0
Balance Sheet 24,783 28,309
Capitalized Fees & Expenses (96) (161)
Other long term debt [Member]    
Debt Instrument [Line Items]    
Outstanding Balance 1,703 1,910
Original Issuer Discount 0 0
Balance Sheet 1,703 1,886
Capitalized Fees & Expenses $ 0 $ (24)