Short-term investments - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
Jan. 02, 2016 |
Jan. 03, 2015 |
|
| Investments Schedule [Abstract] | ||
| Recognized gross realized loss from the sale of mutual funds | $ 0 | $ 0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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