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LONG-TERM DEBT (Details) - Summary of Long-Term Debt - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]      
Outstanding Balance $ 949,698 $ 861,199  
less: Current portion, Outstanding Balance (17,776) (16,593)  
Long-term debt, Outstanding Balance 931,922 844,606  
Original Issuer Discount (3,888) (5,594)  
less: Current portion, Original Issuer Discount 0 0  
Long-term debt, Original Issuer Discount (3,888) (5,594)  
Balance Sheet 931,614 843,569  
less: Current portion 17,776 16,593  
Long-term debt 913,838 826,976  
Capitalized Fees & Expenses (14,196) (12,036) $ (12,036)
Senior notes due 2022 [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 725,000 600,000  
Original Issuer Discount (1,514) 0  
Balance Sheet 713,234 591,736  
Capitalized Fees & Expenses $ (10,252) $ 8,264  
Coupon Interest Rate 5.25% 5.25%  
Revolver due 2019 [Member]      
Debt Instrument [Line Items]      
Outstanding Balance $ 0 $ 35,000  
Original Issuer Discount 0 0  
Balance Sheet (2,583) 32,951  
Capitalized Fees & Expenses (2,583)   $ (2,049)
Convert. debt due 2017 [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 100,000 100,000  
Original Issuer Discount (2,374) (5,594)  
Balance Sheet 97,388 93,835  
Capitalized Fees & Expenses $ (238) $ (571)  
Coupon Interest Rate 4.00% 4.00%  
Real estate mortgages [Member]      
Debt Instrument [Line Items]      
Outstanding Balance $ 38,533 $ 32,280  
Original Issuer Discount 0 0  
Balance Sheet 37,911 31,810  
Capitalized Fees & Expenses (622) (470)  
ESOP Loans [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 35,092 36,744  
Original Issuer Discount 0 0  
Balance Sheet 34,921 36,520  
Capitalized Fees & Expenses (171) (224)  
Capital lease - real estate [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 6,722 7,524  
Original Issuer Discount 0 0  
Balance Sheet 6,585 7,368  
Capitalized Fees & Expenses $ (137) $ (156)  
Coupon Interest Rate 5.00% 5.00%  
Non U.S. lines of credit [Member]      
Debt Instrument [Line Items]      
Outstanding Balance $ 6,078 $ 8,934  
Original Issuer Discount 0 0  
Balance Sheet 6,073 8,931  
Capitalized Fees & Expenses (5) (3)  
Non U.S. term loans [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 34,723 39,142  
Original Issuer Discount 0 0  
Balance Sheet 34,557 38,843  
Capitalized Fees & Expenses (166) (299)  
Other long term debt [Member]      
Debt Instrument [Line Items]      
Outstanding Balance 3,550 1,575  
Original Issuer Discount 0 0  
Balance Sheet 3,528 1,575  
Capitalized Fees & Expenses $ (22) $ 0