ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014 USD ($) Segment		Sep. 30, 2013 USD ($)
Accounting Policies [Abstract]
Foreign currency translation adjustment, net of income tax benefit of $0, $0 and $0, respectively		$ (5,731)				$ (5,851)				$ (5,731)	$ (5,851)		$ (5,851)
Net retirement plan liability adjustment, net of income tax benefit of ($3,758), ($2,909) and ($2,409), respectively		(6,257)				(4,757)				(6,257)	(4,757)		(3,866)
Interest rate swap agreement, net of income tax benefit of $0, $1 and $16, respectively		0				(5)				0	(5)		(26)
Total accumulated other comprehensive loss		$ (11,988)				$ (10,613)				(11,988)	(10,613)		(9,743)
Foreign currency translation adjustment, income tax benefit										0	0		0
Net pension liability adjustment, income tax benefit										3,758	2,909		2,409
Other comprehensive Income (Loss), derivatives qualifying as hedges, tax, portion attributable to parent										$ 0	$ 1		16
Number of operating segments | Segment										1,000	1,000
Number of foreign currency derivatives held		0				0				0	0
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance					$ 76,620				$ 72,013	$ 76,620	$ 72,013		60,142
Other comprehensive income (loss) before reclassifications										(1,721)	(1,158)
Amounts reclassified from accumulated other comprehensive income (loss)										346	288
Net current-period other comprehensive income										(1,375)	(870)
Ending Balance		$ 73,069				$ 76,620				73,069	76,620		72,013
Income (loss) before income tax provision (benefit)										(6,025)	8,356		13,846
Income tax benefit (expense)										2,444	(2,753)		(4,088)
Net income (loss)		(393)	$ (1,007)	$ (64)	(1,408)	743	$ 1,907	$ 1,426	947	(2,872)	5,023		10,234
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance					(5,851)				(5,851)	(5,851)	$ (5,851)
Other comprehensive income (loss) before reclassifications										120
Amounts reclassified from accumulated other comprehensive income (loss)										0	$ 0
Net current-period other comprehensive income										120	0
Ending Balance		(5,731)				(5,851)				(5,731)	(5,851)		(5,851)
Retirement Plan Liability adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance					(4,757)				(3,866)	(4,757)	(3,866)
Other comprehensive income (loss) before reclassifications										(1,846)	(1,179)
Amounts reclassified from accumulated other comprehensive income (loss)										346	288
Net current-period other comprehensive income										(1,500)	(891)
Ending Balance		(6,257)				(4,757)				(6,257)	(4,757)		(3,866)
Interest rates swap adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance					$ (5)				$ (26)	(5)	(26)
Other comprehensive income (loss) before reclassifications										5	21
Amounts reclassified from accumulated other comprehensive income (loss)										0	0
Net current-period other comprehensive income										5	21
Ending Balance		$ 0				$ (5)				0	(5)		$ (26)
Reclassification out of Accumulated Other Comprehensive Income | Retirement Plan Liability adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Income (loss) before income tax provision (benefit)										545	450
Income tax benefit (expense)										(199)	(162)
Net income (loss)										346	288
Reclassification out of Accumulated Other Comprehensive Income | Prior service costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Income (loss) before income tax provision (benefit)	[1]									0	0
Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Income (loss) before income tax provision (benefit)	[1]									(545)	(450)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans, Settlements And Curtailments, Attributable To Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI, Pension And Other Postretirement Benefit Plans, Settlements And Curtailments, Before Tax										$ 0	$ 0	[1]

[1] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See Note 7 - Retirement benefit plans for further information.