Goodwill and Intangible Assets (Tables)

12 Months Ended

Jan. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill by applicable reporting unit were as follows:



(in thousands)	Signal Integrity		Power and High-Reliability		Wireless and Sensing		Total
Balance at January 29, 2017	$	261,891	$	49,384	$	18,428	$	329,703
Additions	12,194		—		—		12,194
Balance at January 28, 2018	$	274,085	$	49,384	$	18,428	$	341,897

Schedule of finite-lived intangible assets which continue to be amortized

The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions and technology licenses purchased, which continue to be amortized:



		January 28, 2018							January 29, 2017
(in thousands)	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core technologies	5-8 years	$	164,930	$	(115,628	)	$	49,302	$	144,930	$	(92,940	)	$	51,990
Customer relationships	3-10 years	34,031		(25,426		)	8,605		30,030		(20,247		)	9,783
Total finite-lived intangible assets		$	198,961	$	(141,054	)	$	57,907	$	174,960	$	(113,187	)	$	61,773

Schedule of amortization expenses recorded in the Statements of Income

Amortization expenses recorded in the Statements of Income for each period were as follows:



(in thousands)	January 28, 2018		January 29, 2017		January 31, 2016
Core technologies	$	22,688	$	20,901	$	20,692
Customer relationships	5,179		4,400		4,367
Total amortization expense	$	27,867	$	25,301	$	25,059

Schedule of future amortization expense

Future amortization expense by operating segment is expected to be as follows:



(in thousands)
To be recognized in:	Core Technologies		Customer relationships		Total
Fiscal year 2019	$	20,666	$	5,733	$	26,399
Fiscal year 2020	13,239		2,283		15,522
Fiscal year 2021	6,389		589		6,978
Fiscal year 2022	3,905		—		3,905
Fiscal year 2023	3,714		—		3,714
Thereafter	1,389		—		1,389
Total expected amortization expense	$	49,302	$	8,605	$	57,907

Schedule of indefinite-lived intangible assets

The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to IPR&D:



(in thousands)	Net Carrying Amount
Value at January 31, 2016	$	—
Value at January 29, 2017	—
In-process research and development through acquisitions	2,300
Value at January 28, 2018	$	2,300