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Summary of Significant Accounting Policies - Fair Value Hierarchy for Financial Assets (Detail) - Recurring - USD ($)
$ in Thousands
Jul. 04, 2015
Jan. 03, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjusted Basis Cost $ 119,397 $ 134,453
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Estimated Fair Value 119,397 134,453
Cash and Cash Equivalents 119,397 134,453
Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjusted Basis Cost 80,030 92,888
Gross Unrealized Gains   0
Gross Unrealized (Losses) 0 0
Estimated Fair Value 80,030 92,888
Cash and Cash Equivalents 80,030 92,888
Level 1:    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjusted Basis Cost 39,367 41,565
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Estimated Fair Value 39,367 41,565
Cash and Cash Equivalents 39,367 41,565
Level 1: | Bank Time Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjusted Basis Cost 32,500 40,500
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Estimated Fair Value 32,500 40,500
Cash and Cash Equivalents 32,500 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 6,867 1,065
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Estimated Fair Value 6,867 1,065
Cash and Cash Equivalents 6,867 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