ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income by component
Balance at beginning of period	$ (28,156)	$ 17,351	$ (14,072)	$ 11,533
Other comprehensive income (loss) before reclassifications	(38,896)	21	(53,015)	5,810
Amounts reclassified from accumulated other comprehensive income	35	30	70	59
Balance at end of period	(67,017)	17,402	(67,017)	17,402
Reclassifications out of Accumulated Other Comprehensive Income
Amortization	55	47	110	93
Tax effects	(20)	(17)	(40)	(34)
Total reclassification for the period	35	30	70	59
Defined Benefit Plans
Changes in Accumulated Other Comprehensive Income by component
Balance at beginning of period	(6,216)	(5,420)	(6,251)	(5,449)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	35	30	70	59
Balance at end of period	(6,181)	(5,390)	(6,181)	(5,390)
Reclassifications out of Accumulated Other Comprehensive Income
Total reclassification for the period	35	30	70	59
Foreign Currency Translation Adjustments
Changes in Accumulated Other Comprehensive Income by component
Balance at beginning of period	(21,882)	22,882	(7,759)	17,091
Other comprehensive income (loss) before reclassifications	(38,898)	(2)	(53,021)	5,789
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Balance at end of period	(60,780)	22,880	(60,780)	22,880
Reclassifications out of Accumulated Other Comprehensive Income
Total reclassification for the period	0	0	0	0
Fair Value of Interest Swap Agreements
Changes in Accumulated Other Comprehensive Income by component
Balance at beginning of period	(58)	(111)	(62)	(109)
Other comprehensive income (loss) before reclassifications	2	23	6	21
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Balance at end of period	(56)	(88)	(56)	(88)
Reclassifications out of Accumulated Other Comprehensive Income
Total reclassification for the period	$ 0	$ 0	$ 0	$ 0