CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Property, plant and equipment, net of accumulated depreciation	$ 116,976	$ 115,728
Intangible assets, net of accumulated amortization	$ 96,926	$ 92,274
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	50,000,000	50,000,000
Common stock, shares issued	30,534,786	30,534,786
Treasury stock, shares	4,623,958	4,623,958