Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands |
May 04, 2019 |
Aug. 25, 2018 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Short-term marketable debt securities | $ 43,998 | $ 59,444 |
| Long-term marketable debt securities | $ 69,337 | $ 75,232 |