Fair Value of Financial Instruments (Details) - Major Types of Debt and Equity Securities [Domain] - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	$ 3		$ 414
Total fair value of financial instruments	36,640		139,647
Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	36,637		139,233
Short-term marketable securities | Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	36,637		139,233
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	0		0
Total fair value of financial instruments	31,020		139,233
Level 1 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	31,020		139,233
Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	3		414
Total fair value of financial instruments	5,620		414
Level 2 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	5,617		0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency forward exchange contracts, net	0		0
Total fair value of financial instruments	0		0
Level 3 | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of marketable securities	0		$ 0
Maximum | Short-term marketable securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gain (loss)	$ 100	$ (100)