CAPITAL ASSETS

Property and Equipment

Property and equipment, net are as follows:



	December 29, 2018			September 29, 2018
Land and improvements	$	2,881		$	2,881
Buildings and improvements	58,750			58,880
Machinery and equipment	207,275			203,647
Assets held under capital leases	2,796			2,815
Total property and equipment	271,702			268,223
Less: Accumulated depreciation	(182,436		)	(177,954		)
Total property and equipment, net	$	89,266		$	90,269

Goodwill

Changes to the carrying amount of goodwill are as follows:



	Test & Simulation		Sensors			Total
Balance, September 29, 2018	$	24,631	$	344,644		$	369,275
Acquisitions ¹	32,791		—			32,791
Currency translation	100		(14		)	86
Balance, December 29, 2018	$	57,522	$	344,630		$	402,152

¹ See Note 18 for additional information regarding acquisitions.

Intangible Assets

Intangible assets are as follows:



	December 29, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Weighted Average Useful Life (in Years)
Software development costs²	$	33,478	$	(15,859	)	$	17,619	6.4
Technology and patents	59,079		(13,005		)	46,074		14.9
Trademarks and trade names	12,688		(3,162		)	9,526		20.5
Customer lists	178,655		(25,957		)	152,698		15.7
Land-use rights	2,332		(791		)	1,541		26.0
Other	3,205		(87		)	3,118		4.0
Trade names	57,500		—			57,500		Indefinite
Total intangible assets	$	346,937	$	(58,861	)	$	288,076	14.6



	September 29, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Weighted Average Useful Life (in Years)
Software development costs²	$	31,251	$	(15,860	)	$	15,391	6.5
Technology and patents	46,405		(12,188		)	34,217		14.9
Trademarks and trade names	6,754		(2,987		)	3,767		25.4
Customer lists	156,971		(23,314		)	133,657		15.8
Land-use rights	2,336		(730		)	1,606		26.0
Trade names	57,500		—			57,500		Indefinite
Total intangible assets	$	301,217	$	(55,079	)	$	246,138	14.8


²	The gross carrying amount of software development costs as of December 29, 2018 and September 29, 2018 includes $17,619 and $15,391, respectively, of intangible assets not yet placed in service.

Amortization expense recognized is as follows:



	Three Months Ended
	December 29, 2018		December 30, 2017
Amortization expense	$	3,816	$	3,479

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



	Amortization Expense
Remainder of 2019	$	12,794
2020	16,779
2021	17,784
2022	18,607
2023	17,817
2024	17,465
Thereafter	129,330

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.