LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	$ 15,295	$ 11,733	$ 30,891	$ 23,136
Amort. Debt Discount	68	258	135	1,383
Amort. Deferred Cost & Other Fees	1,443	729	2,619	1,496
Total Interest Expense	$ 16,806	$ 12,720	$ 33,645	$ 26,015
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%	5.50%
Cash Interest	$ 13,125	$ 9,515	$ 26,250	$ 19,031
Amort. Debt Discount	68	68	135	135
Amort. Deferred Cost & Other Fees	943	461	1,882	934
Total Interest Expense	14,136	10,044	28,267	20,100
Revolver due 2021 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	922	1,326	2,278	1,651
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	140	150	281	282
Total Interest Expense	1,062	$ 1,476	2,559	$ 1,933
Convert. debt due 2017 [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate		9.10%		8.90%
Cash Interest	0	$ 167	0	$ 1,167
Amort. Debt Discount	0	190	0	1,248
Amort. Deferred Cost & Other Fees	0	37	0	148
Total Interest Expense	0	$ 394	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	166	$ 158	351	$ 278
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	303	8	320	10
Total Interest Expense	$ 469	$ 166	$ 671	$ 288
ESOP Loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	4.60%	3.30%	4.30%	4.10%
Cash Interest	$ 442	$ 369	$ 855	$ 733
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	31	38	62	65
Total Interest Expense	$ 473	$ 407	$ 917	$ 798
Capital lease - real estate [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Effective Interest Rate	5.50%	5.40%	10.70%	5.40%
Cash Interest	$ 327	$ 75	$ 491	$ 155
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	7	6	13	12
Total Interest Expense	334	81	504	167
Non U.S. lines of credit [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	4	21	11	25
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	7	7	10
Total Interest Expense	4	28	18	35
Non U.S. term loans [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	330	236	664	458
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	18	18	51	29
Total Interest Expense	348	254	715	487
Other long term debt [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	114	48	229	122
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	1	4	3	6
Total Interest Expense	115	52	232	128
Capitalized interest [Member]
LONG-TERM DEBT (Details) - Summary of Interest Expense Incurred [Line Items]
Cash Interest	135	182	238	484
Amort. Debt Discount	0	0	0	0
Amort. Deferred Cost & Other Fees	0	0	0	0
Total Interest Expense	$ 135	$ 182	$ 238	$ 484