Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, consisting primarily of money market accounts and short-term certificates of deposit	$ 50,735		$ 189,381
Marketable trading securities	53,856	[1]	46,938	[1]
Derivative assets	2,942		2,897
Total assets at fair value	107,533		239,216
Derivative liabilities	8,887		3,776
Contingent consideration	3,650
Total liabilities at fair value	12,537		3,776
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, consisting primarily of money market accounts and short-term certificates of deposit	50,735		189,381
Marketable trading securities	53,856	[1]	46,938	[1]
Total assets at fair value	104,591		236,319
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,942		2,897
Total assets at fair value	2,942		2,897
Derivative liabilities	8,887		3,776
Total liabilities at fair value	8,887		3,776
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	3,650		0
Total liabilities at fair value	$ 3,650		$ 0

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