Summary of Significant Accounting Policies - Fair Value Hierarchy for Financial Assets (Detail) - Recurring - USD ($) $ in Thousands	Oct. 03, 2015	Jan. 03, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	$ 103,581	$ 134,453
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	103,581	134,453
Cash and Cash Equivalents	103,581	134,453
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	84,871	92,888
Gross Unrealized Gains		0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	84,871	92,888
Cash and Cash Equivalents	84,871	92,888
Level 1:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	18,710	41,565
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	18,710	41,565
Cash and Cash Equivalents	18,710	41,565
Level 1: | Bank Time Deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	17,500	40,500
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	17,500	40,500
Cash and Cash Equivalents	17,500	40,500
Level 1: | U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	0	0
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	0	0
Cash and Cash Equivalents	0	0
Level 1: | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	1,210	1,065
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	1,210	1,065
Cash and Cash Equivalents	1,210	1,065
Level 2:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	0	0
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	0	0
Cash and Cash Equivalents	0	0
Level 3:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Adjusted Basis Cost	0	0
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	0	0
Cash and Cash Equivalents	$ 0	$ 0