GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill activity

Goodwill activity for each of the Company’s reportable segments, which carry goodwill, Electronic Materials and Performance Materials, for the six months ended March 31, 2020. 

	Electronic Materials		Performance Materials		Total
Balance at September 30, 2019	$	352,797	$	357,274	$	710,071
Foreign currency translation impact	465		(1,918)		(1,453)
Other	—		1,205		1,205
Balance at March 31, 2020	$	353,262	$	356,561	$	709,823

Schedule of other intangible assets

The components of other intangible assets are:

	March 31, 2020				September 30, 2019
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets subject to amortization:
Product technology, trade secrets and know-how	$	121,579	$	42,230	$	123,948	$	37,993
Acquired patents and licenses	9,023		8,558		9,023		8,397
Customer relationships, trade names, and distribution rights	685,061		103,386		684,764		64,471
Total other intangible assets subject to amortization	815,663		154,174		817,735		110,861
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*	47,170				47,170
Total other intangible assets not subject to amortization	47,170				47,170
Total other intangible assets	$	862,833	$	154,174	$	864,905	$	110,861

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

Schedule of amortization expense on intangible assets

Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2020	$	42,429
2021	90,474
2022	80,974
2023	68,480
2024	60,528