Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Detail) (Fair value, measurements, recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 29, 2014		Dec. 28, 2013
Assets:
Cash equivalents, consisting primarily of money market accounts and short-term certificates of deposit	$ 585		$ 50,735
Marketable trading securities	54,432	[1]	53,856	[1]
Derivative assets	5,021		2,942
Total assets at fair value	60,038		107,533
Liabilities:
Derivative liabilities	4,502		8,887
Contingent consideration	3,650		3,650
Total liabilities at fair value	8,152		12,537
Level 1 [Member]
Assets:
Cash equivalents, consisting primarily of money market accounts and short-term certificates of deposit	585		50,735
Marketable trading securities	54,432	[1]	53,856	[1]
Total assets at fair value	55,017		104,591
Level 2 [Member]
Assets:
Derivative assets	5,021		2,942
Total assets at fair value	5,021		2,942
Liabilities:
Derivative liabilities	4,502		8,887
Total liabilities at fair value	4,502		8,887
Level 3 [Member]
Liabilities:
Contingent consideration	3,650		3,650
Total liabilities at fair value	$ 3,650		$ 3,650

[1] Included in other current assets in our consolidated balance sheet.