GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Goodwill		$ 101,812	$ 100,639		$ 101,812
Goodwill, Other Increase (Decrease)					145
Foreign exchange fluctuation					1,028
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, gross carrying amount		81,292	80,914		81,292
Accumulated amortization		41,839	35,628		41,839
Indefinite-lived Intangible Assets by Major Class [Line Items]
Total other intangible assets not subject to amortization		5,190	5,190		5,190
Total other intangible assets, gross carrying amount		86,482	86,104		86,482
Other intangible assets [Abstract]
Amortization expense		1,935		$ 2,072	5,860	$ 6,026
Estimated future amortization expense [Abstract]
Remainder of 2017		1,934			1,934
2018		7,117			7,117
2019		6,675			6,675
2020		6,670			6,670
2021		6,664			6,664
Impairment expense			1,000
In-process Technology [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Total other intangible assets not subject to amortization		4,000	4,000		4,000
Other Indefinite-lived Intangibles [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Total other intangible assets not subject to amortization	[1]	1,190	1,190		1,190
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, gross carrying amount		42,278	42,194		42,278
Accumulated amortization		16,396	12,718		16,396
Acquired Patents and Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, gross carrying amount		8,270	8,270		8,270
Accumulated amortization		8,239	8,155		8,239
Trade Secrets and Know-how [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, gross carrying amount		2,550	2,550		2,550
Accumulated amortization		2,550	2,550		2,550
Customer Relationships, Distribution Rights and Other
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, gross carrying amount		28,194	27,900		28,194
Accumulated amortization		$ 14,654	$ 12,205		$ 14,654

[1] Other indefinite-lived intangible assets not subject to amortization consist primarily of trade names.