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Investments - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Investments maximum maturity period | 5 years |
Unrealized losses, net of unrealized gains, on the investments in the bond portfolio | $ 1,184,000 | $ 223,000
Guarantee Payment of Insurance Claims |  |
Debt Securities, Available-for-sale [Line Items] |  |
Letters of credit outstanding | 62,345,000 |
Current Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 40,058,000 |
Non-Current Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 29,214,000 |
Total non-current investments | $ 72,117,000 |

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