CAPITAL ASSETS

Property and Equipment

Property and equipment, net are as follows:



	March 31, 2018			September 30, 2017
Land and improvements	$	2,869		$	2,867
Buildings and improvements	61,793			60,340
Machinery and equipment	201,351			196,621
Assets held under capital leases	2,815			2,747
Total property and equipment	268,828			262,575
Less: Accumulated depreciation	(173,255		)	(162,645		)
Total property and equipment, net	$	95,573		$	99,930

Assets held under capital leases, consisting of machinery and equipment, are recorded at the present value of minimum lease payments and are amortized on a straight-line basis over the estimated life of the asset or the lease term. Amortization of assets held as capital leases is included in depreciation expense in the Consolidated Statements of Income.

Goodwill

Changes to the carrying amount of goodwill are as follows:



	Test		Sensors		Total
Balance, September 30, 2017	$	25,109	$	344,653	$	369,762
Currency translation	715		36		751
Balance, March 31, 2018	$	25,824	$	344,689	$	370,513

Intangible Assets

Intangible assets are as follows:



	March 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Weighted Average Useful Life (in Years)
Software development costs	$	27,999	$	(15,859	)	$	12,140	5.9
Technology and patents	47,218		(11,212		)	36,006		14.9
Trademarks and trade names	7,208		(2,852		)	4,356		25.7
Customer lists	157,000		(18,342		)	138,658		15.8
Land-use rights	2,437		(627		)	1,810		26.9
Trade names	57,500		—			57,500		Indefinite
Total intangible assets	$	299,362	$	(48,892	)	$	250,470	14.9



	September 30, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Weighted Average Useful Life (in Years)
Software development costs	$	26,083	$	(15,830	)	$	10,253	5.9
Technology and patents	46,731		(9,399		)	37,332		14.9
Trademarks and trade names	6,936		(2,484		)	4,452		25.6
Customer lists	157,016		(13,359		)	143,657		15.8
Land-use rights	2,377		(492		)	1,885		26.4
Trade names	57,500		—			57,500		Indefinite
Total intangible assets	$	296,643	$	(41,564	)	$	255,079	15.0

Amortization expense recognized is as follows:



	Three Months Ended				Six Months Ended
	March 31, 2018		April 1, 2017		March 31, 2018		April 1, 2017
Amortization expense	$	3,456	$	3,663	$	6,935	$	7,328

Estimated future amortization expense related to finite-lived intangible assets is as follows:



	Amortization Expense
Remainder of 2018	$	8,042
2019	15,989
2020	15,708
2021	15,708
2022	15,524
2023	14,240
Thereafter	107,759

Future amortization amounts presented above are estimates. Actual future amortization expense may be different due to fluctuations in foreign currency exchange rates, future acquisitions, impairments, changes in amortization periods or other factors.