Annual report pursuant to Section 13 and 15(d)

Investments - Additional Information (Detail)

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Investments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Investments Schedule [Abstract]    
Recognized gross realized loss from the sale of mutual funds $ 1us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 1us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses