Fair Value Measurements (Tables)

3 Months Ended

Apr. 02, 2017

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured On Recurring Basis

	As of April 2, 2017
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(In thousands)
Assets:
Cash equivalents: money-market funds	$	12,971	$	12,971	$	—	$	—
Available-for-sale securities: U.S. treasuries (1)	123,732		123,732		—		—
Available-for-sale securities: certificates of deposit (1)	158		158		—		—
Trading securities: mutual funds (1)	1,677		1,677		—		—
Foreign currency forward contracts (2)	2,882		—		2,882		—
Total assets measured at fair value	$	141,420	$	138,538	$	2,882	$	—

	As of December 31, 2016
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(In thousands)
Assets:
Cash equivalents: money-market funds	$	17,027	$	17,027	$	—	$	—
Available-for-sale securities: U.S. treasuries (1)	123,838		123,838		—		—
Available-for-sale securities: certificates of deposit (1)	148		148		—		—
Trading securities: mutual funds (1)	1,528		1,528		—		—
Foreign currency forward contracts (2)	8,763		—		8,763		—
Total assets measured at fair value	$	151,304	$	142,541	$	8,763	$	—

Fair Value, Liabilities Measured On Recurring Basis

	As of April 2, 2017
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(In thousands)
Liabilities:
Foreign currency forward contracts (3)	$	1,058	$	—	$	1,058	$	—
Total liabilities measured at fair value	$	1,058	$	—	$	1,058	$	—

	As of December 31, 2016
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(In thousands)
Liabilities:
Foreign currency forward contracts (3)	$	1,705	$	—	$	1,705	$	—
Total liabilities measured at fair value	$	1,705	$	—	$	1,705	$	—