Goodwill and Intangible Assets (Tables)

6 Months Ended

Jul. 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	16,872		—		—		16,872
Balance at July 30, 2017	$	278,763	$	49,384	$	18,428	$	346,575

Schedule of Finite-Lived Intangible Assets

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

		July 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	$	164,930	$	(103,590	)	$	61,340	$	144,930	$	(92,940	)	$	51,990
Customer relationships	5-10 years	34,030		(22,558		)	11,472		30,030		(20,247		)	9,783
Total finite-lived intangible assets		$	198,960	$	(126,148	)	$	72,812	$	174,960	$	(113,187	)	$	61,773

Schedule of Finite-lived Intangible Assets Acquired

The following table sets forth the Company’s finite-lived intangible assets resulting from acquisitions:

(in thousands)	Gross Carrying Amount
Value at January 29, 2017	$	174,960
Acquired intangible assets	24,000
Value at July 30, 2017	$	198,960

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 29, 2017	$	—
In-process research and development through acquisitions	2,300
Value at July 30, 2017	$	2,300