LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	$ 15,103	$ 11,784	$ 45,994	$ 34,920
Amort. Debt Discount	67	67	202	1,450
Amort. Deferred Cost & Other Fees	1,158	828	3,777	2,324
Total Interest Expense	$ 16,328	$ 12,679	$ 49,973	$ 38,694
Senior notes due 2022 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.70%	5.50%	5.70%	5.60%
Cash Interest	$ 13,125	$ 9,516	$ 39,375	$ 28,547
Amort. Debt Discount	67	67	202	202
Amort. Deferred Cost & Other Fees	957	462	2,839	1,396
Total Interest Expense	14,149	10,045	42,416	30,145
Revolver due 2021 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	1,239	1,629	3,517	3,280
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	141	140	422	422
Total Interest Expense	1,380	$ 1,769	3,939	$ 3,702
Convert. debt due 2017 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate				8.90%
Cash Interest			0	$ 1,167
Amort. Debt Discount			0	1,248
Amort. Deferred Cost & Other Fees			0	148
Total Interest Expense			0	$ 2,563
Real estate mortgages [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate		2.40%		2.40%
Cash Interest	0	$ 142	351	$ 420
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	46	320	56
Total Interest Expense	$ 0	$ 188	$ 671	$ 476
ESOP Loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.50%	3.30%	4.70%	4.10%
Cash Interest	$ 472	$ 414	$ 1,327	$ 1,147
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	31	29	93	94
Total Interest Expense	$ 503	$ 443	$ 1,420	$ 1,241
Capital lease - real estate [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.60%	5.40%	5.50%	5.40%
Cash Interest	$ 42	$ 72	$ 533	$ 227
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	6	7	19	19
Total Interest Expense	48	79	552	246
Non U.S. lines of credit [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	22	45	33	70
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	4	75	11	85
Total Interest Expense	26	120	44	155
Non U.S. term loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	338	102	1,002	560
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	18	68	69	97
Total Interest Expense	356	170	1,071	657
Other long term debt [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	33	64	262	186
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	1	1	4	7
Total Interest Expense	34	65	266	193
Capitalized interest [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	168	200	406	684
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	0	0	0
Total Interest Expense	$ 168	$ 200	$ 406	$ 684