Acquisitions - Intangible Assets Related to Acquisition (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended		0 Months Ended				0 Months Ended					0 Months Ended		0 Months Ended		0 Months Ended
	Sep. 28, 2014	Dec. 31, 2013	Jun. 11, 2014 Prosoft Technology, Inc. [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Backlog [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Trademarks [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Customer relationships [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Developed technologies [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Trademarks [Member]	Jun. 11, 2014 Prosoft Technology, Inc. [Member] Backlog [Member]	Mar. 31, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member] Trademarks [Member]	Mar. 31, 2014 Grass Valley [Member] In-process research and development [Member]	Mar. 31, 2014 Grass Valley [Member] Customer relationships [Member]	Mar. 31, 2014 Grass Valley [Member] Customer relationships [Member]	Mar. 31, 2014 Grass Valley [Member] Developed technologies [Member]	Mar. 31, 2014 Grass Valley [Member] Developed technologies [Member]	Mar. 31, 2014 Grass Valley [Member] Backlog [Member]	Mar. 31, 2014 Grass Valley [Member] Backlog [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets subject to amortization			$ 40,800	$ 200		$ 26,600	$ 9,000	$ 5,000			$ 65,500				$ 27,000		$ 37,000		$ 1,500
Goodwill	939,500	773,048	57,075								118,733
Intangible assets not subject to amortization			57,075								148,733	22,000	8,000
Total intangible assets			$ 97,875								$ 214,233
Weighted average amortization period			14 years 9 months 18 days		5 years	20 years	5 years		3 months 18 days	9 years				15 years		5 years		3 months 18 days