Fair Value Measurement of Assets and Liabilities on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands |
Mar. 26, 2016 |
Dec. 26, 2015 |
|---|---|---|
| Assets: | ||
| Cash equivalents | $ 32,732 | $ 88,108 |
| Fair Value, Inputs, Level 1 | ||
| Assets: | ||
| Cash equivalents | $ 32,732 | $ 88,108 |