5.	Goodwill and other intangible assets

Changes in the carrying amount of goodwill for the nine months ended July 31, 2018 by operating segment are as follows:

	Adhesive Dispensing Systems		Advanced Technology Systems		Industrial Coating Systems		Total
Balance at October 31, 2017	$	392,295	$	1,172,857	$	24,058	$	1,589,210
Acquisitions		—		21,912		—		21,912
Currency effect		445		166		—		611
Balance at July 31, 2018	$	392,740	$	1,194,935	$	24,058	$	1,611,733

Accumulated impairment losses, which were recorded in 2009, were $232,789 at July 31, 2018 and October 31, 2017. Of these losses, $229,173 related to the Advanced Technology Systems segment, and $3,616 related to the Industrial Coating Systems segment.

Information regarding our intangible assets subject to amortization is as follows:

	July 31, 2018
	Carrying Amount		Accumulated Amortization		Net Book Value
Customer relationships	$	482,351	$	129,563	$	352,788
Patent/technology costs		154,533		57,498		97,035
Trade name		96,588		33,259		63,329
Non-compete agreements		11,563		9,873		1,690
Other		1,388		1,387		1
Total	$	746,423	$	231,580	$	514,843

	October 31, 2017
	Carrying Amount		Accumulated Amortization		Net Book Value
Customer relationships	$	480,536	$	102,033	$	378,503
Patent/technology costs		150,581		48,669		101,912
Trade name		93,281		28,366		64,915
Non-compete agreements		11,142		9,298		1,844
Other		1,384		1,378		6
Total	$	736,924	$	189,744	$	547,180

Amortization expense for the three months ended July 31, 2018 and 2017 was $14,036 and $13,689, respectively. Amortization expense for the nine months ended July 31, 2018 and 2017 was $42,097 and $31,478, respectively.