LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	$ 15,996	$ 15,103	$ 47,200	$ 45,994
Amort. Debt Discount	(68)	(67)	(202)	(202)
Amort. Deferred Cost & Other Fees	(1,224)	(1,158)	(3,932)	(3,777)
Total Interest Expense	$ (17,288)	$ (16,328)	$ (51,334)	$ (49,973)
Senior notes due 2022 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.70%	5.70%	5.70%	5.70%
Cash Interest, including amounts capitalized	$ 13,125	$ 13,125	$ 39,375	$ 39,375
Amort. Debt Discount	(68)	(67)	(202)	(202)
Amort. Deferred Cost & Other Fees	(950)	(957)	(2,852)	(2,839)
Total Interest Expense	(14,143)	(14,149)	(42,429)	(42,416)
Revolver due 2021 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, including amounts capitalized	2,282	1,239	4,846	3,517
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	(220)	(141)	(761)	(422)
Total Interest Expense	(2,502)	(1,380)	(5,607)	(3,939)
Real estate mortgages [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, including amounts capitalized	0	0	0	351
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	0	0	(320)
Total Interest Expense	0	$ 0	$ 0	$ (671)
ESOP Loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate		5.50%	6.60%	4.70%
Cash Interest, including amounts capitalized	0	$ 472	$ 937	$ 1,327
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	(31)	(186)	(93)
Total Interest Expense	$ 0	$ (503)	$ (1,123)	$ (1,420)
Capital lease - real estate [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.60%	5.60%	5.50%	5.50%
Cash Interest, including amounts capitalized	$ 78	$ 42	$ 294	$ 533
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	(7)	(6)	(19)	(19)
Total Interest Expense	(85)	(48)	(313)	(552)
Non U.S. lines of credit [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, including amounts capitalized	4	22	15	33
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	(3)	(4)	(11)	(11)
Total Interest Expense	(7)	(26)	(26)	(44)
Non U.S. term loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, including amounts capitalized	376	338	1,273	1,002
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	(44)	(18)	(97)	(69)
Total Interest Expense	(420)	(356)	(1,370)	(1,071)
Other long term debt [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, including amounts capitalized	149	33	478	262
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	(1)	(6)	(4)
Total Interest Expense	(149)	(34)	(484)	(266)
Capitalized interest [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest, Capitalized interest	(18)	(168)	(18)	(406)
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	0	0	0
Total Interest Expense	$ (18)	$ (168)	$ (18)	$ (406)