Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands |
Jan. 30, 2016 |
Apr. 25, 2015 |
|---|---|---|
| Assets: | ||
| Cash equivalents | $ 5,151 | $ 90,569 |
| Derivative instruments | 1,184 | 1,255 |
| Total assets | 6,335 | 91,824 |
| Liabilities: | ||
| Derivative instruments | 1,184 | 1,255 |
| Fair Value, Inputs, Level 1 [Member] | ||
| Assets: | ||
| Cash equivalents | 5,151 | 90,569 |
| Derivative instruments | 0 | 0 |
| Total assets | 5,151 | 90,569 |
| Liabilities: | ||
| Derivative instruments | 0 | 0 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Assets: | ||
| Cash equivalents | 0 | 0 |
| Derivative instruments | 1,184 | 1,255 |
| Total assets | 1,184 | 1,255 |
| Liabilities: | ||
| Derivative instruments | 1,184 | 1,255 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Assets: | ||
| Cash equivalents | 0 | 0 |
| Derivative instruments | 0 | 0 |
| Total assets | 0 | 0 |
| Liabilities: | ||
| Derivative instruments | $ 0 | $ 0 |