PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation and amortization	$ (111,157,000)	$ (107,895,000)
Property, plant and equipment - net	56,305,000	55,327,000		54,770,000	54,732,000	55,434,000	56,166,000	55,525,000	52,045,000
Depreciation of plant and equipment and amortization of leasehold improvements	8,700,000	8,000,000	7,700,000
Land and land improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	15,996,000	16,045,000
Buildings and improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	45,854,000	44,376,000
Machinery and other equipment
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	95,898,000	94,113,000
Machinery and other equipment | Maximum
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, useful life	10 years
Machinery and other equipment | Minimum
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, useful life	5 years
Leasehold improvements
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, Gross	$ 9,714,000	$ 8,688,000
Leasehold improvements | Maximum
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, useful life	39 years
Leasehold improvements | Minimum
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, useful life	15 years