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Acquisitions - Pro Forma Effect on Operating Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Tripwire [Member]
Business Acquisition [Line Items]
Revenues	$ 598,733	$ 622,174	$ 1,162,104	$ 1,121,665
Income (loss) from continuing operations	$ 29,943	$ (10,717)	$ 17,640	$ (8,608)
Diluted income (loss) per share from continuing operations	$ 0.69	$ (0.24)	$ 0.41	$ (0.19)
Grass Valley and Prosoft [Member]
Business Acquisition [Line Items]
Revenues		$ 614,635		$ 1,178,259
Income (loss) from continuing operations		$ 10,718		$ 12,625
Diluted income (loss) per share from continuing operations		$ 0.24		$ 0.29

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, per diluted share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 10



-Section 50



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-Subparagraph (h)(2)-(3)



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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 805



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