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Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 28, 2013 Y | Dec. 29, 2012 Y
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, maximum maturity period, years | 5 | 5
Unrealized gains, net of unrealized losses, on the investments in the bond portfolio | $ 378,000 | $ 1,407,000
Guarantee Payment Of Insurance Claims |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Letters of credit outstanding | 59,182,000 |
Current Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 34,939,000 |
Non-Current Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 30,819,000 |
Total non-current investments | $ 67,598,000 |

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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