Goodwill and Intangible Assets (Tables)

6 Months Ended

Jul. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill were as follows:



(in thousands)	Signal Integrity		Power and High Reliability		Wireless and Sensing		Total
Balance at January 31, 2016	$	261,891	$	49,384	$	18,428	$	329,703
Additions	—		—		—		—
Balance at July 31, 2016	$	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:



		July 31, 2016							January 31, 2016
(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	$	(82,568	)	$	62,362	$	148,210	$	(74,006	)	$	74,204
Customer relationships	5-10 years	30,030		(18,047		)	11,983		30,030		(15,847		)	14,183
Technology licenses (1)	2 years	100		(83		)	17		100		(57		)	43
Other intangibles assets	1-5 years	6,600		(6,600		)	—		6,600		(6,600		)	—
Total finite-lived intangible assets		$	181,660	$	(107,298	)	$	74,362	$	184,940	$	(96,510	)	$	88,430


(1)	Technology licenses relate to end-license agreements for intellectual property that is used by the Company in research and development activities and also has alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” within the unaudited condensed consolidated statements of operations.

Future Amortization Expense for Intangible Assets

The estimated annual amount of future amortization expense for all finite-lived intangible assets will be as follows:



(in thousands)
To be recognized in:	Core Technologies		Customer Relationships		Technology Licenses		Total
Remaining six months of fiscal year 2017	$	10,372	$	2,200	$	17	$	12,589
Fiscal year 2018	20,744		4,400		—		25,144
Fiscal year 2019	17,332		4,400		—		21,732
Fiscal year 2020	9,905		950		—		10,855
Fiscal year 2021	3,056		33		—		3,089
Thereafter	953		—		—		953
Total expected amortization expense	$	62,362	$	11,983	$	17	$	74,362