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Fair Value Measurements - Financial Assets Valued on Recurring Basis for Cash and Cash Equivalents and Investments (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Jun. 28, 2014 | Dec. 28, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | $ 2,461 | $ 865
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | 2,461 | 865
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |
Valuation Techniques [Member] | Cash and cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | 1,675 | 818
Valuation Techniques [Member] | Investments - mutual funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | 786 | 47
Valuation Techniques [Member] | Level 1 [Member] | Cash and cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | 1,675 | 818
Valuation Techniques [Member] | Level 1 [Member] | Investments - mutual funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value | 786 | 47
Valuation Techniques [Member] | Level 2 [Member] | Cash and cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |
Valuation Techniques [Member] | Level 2 [Member] | Investments - mutual funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |
Valuation Techniques [Member] | Level 3 [Member] | Cash and cash equivalents [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |
Valuation Techniques [Member] | Level 3 [Member] | Investments - mutual funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, fair value |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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