Goodwill and Intangible Assets (Tables)

3 Months Ended

Apr. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amounts of Goodwill

Goodwill by applicable reporting unit is 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	—		—		—		—
Balance at April 30, 2017	$	261,891	$	49,384	$	18,428	$	329,703

Schedule of Finite-Lived Intangible Assets

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:

		April 30, 2017							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	$	144,930	$	(98,126	)	$	46,804	$	144,930	$	(92,940	)	$	51,990
Customer relationships	5-10 years	30,030		(21,347		)	8,683		30,030		(20,247		)	9,783
Technology licenses (1)	2 years	100		(100		)	—		100		(100		)	—
Total finite-lived intangible assets		$	175,060	$	(119,573	)	$	55,487	$	175,060	$	(113,287	)	$	61,773

(1) Technology licenses relate to licensing agreements entered into by the Company that are used in research and development activities and have alternative future uses. Amortization expense related to technology licenses is reported as "Product development and engineering" in the Statements of Income.