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Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Jun. 11, 2014 Prosoft Technology, Inc. [Member]	Sep. 28, 2014 Prosoft Technology, Inc. [Member]	Sep. 28, 2014 Prosoft Technology, Inc. [Member]	Sep. 28, 2014 Prosoft Technology, Inc. [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Sep. 28, 2014 Prosoft Technology, Inc. [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Jan. 25, 2013 Softel Limited [Member]	Mar. 31, 2014 Grass Valley [Member]	Sep. 28, 2014 Grass Valley [Member]	Sep. 28, 2014 Grass Valley [Member]	Mar. 31, 2014 Grass Valley [Member]	Sep. 28, 2014 Grass Valley [Member] Inventories - Obsolescence and Other Valuation Allowances [Member]	Sep. 29, 2013 Grass Valley And Prosoft [Member]
Business Acquisition [Line Items]
Percentage of outstanding shares acquired					100.00%									100.00%
Acquisition price					$ 105,000,000					$ 9,100,000	$ 218,200,000
Fair value of acquired receivables						5,600,000	5,600,000					70,100,000	70,100,000
Acquired receivable, gross contractual amount						6,200,000	6,200,000					79,200,000	79,200,000
Amount of acquired receivables not expected to be collected						600,000	600,000					9,100,000	9,100,000
Goodwill acquired						57,100,000	57,100,000					118,700,000	118,700,000
Period for deducting goodwill for tax purposes						15 years						15 years
Post acquisition revenues						14,400,000	17,100,000					66,200,000	133,000,000
Post acquisition income (loss) from continuing operations						100,000	(300,000)					(7,700,000)	(30,500,000)
Amortization of intangible assets	15,203,000	12,326,000	42,739,000	38,408,000		1,100,000	1,400,000					2,400,000	6,200,000
Cost of sales	389,042,000	339,637,000	1,097,521,000	1,030,052,000				900,000	1,400,000						6,900,000
Inventory cost step-up, pro forma disclosure																8,300,000
Amortization of intangible assets, pro forma disclosure																1,700,000
Transaction costs, pro forma disclosure																$ 1,600,000

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Total costs related to goods produced and sold during the reporting period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Glossary Investing Activities

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