Fair Value Measurements - Company's marketable debt securities measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	May 09, 2020	Aug. 31, 2019	May 04, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 116,217		$ 138,926
Fair Value Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	34,381	$ 67,958
Other long-term assets	81,836	70,968
Total	116,217	138,926
Accrued expenses and other	(16,842)
Level 1 | Fair Value Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	34,381	65,344
Other long-term assets	70,726	65,573
Total	105,107	130,917
Level 2 | Fair Value Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets		2,614
Other long-term assets	11,110	5,395
Total	11,110	8,009
Accrued expenses and other	(16,842)
Level 3 | Fair Value Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets
Other long-term assets
Total
Accrued expenses and other