Fair Value Measurements - Company's marketable debt securities measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Nov. 23, 2019	Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$ 128,371	$ 138,926
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	52,365	67,958
Other long-term assets	76,006	70,968
Total	128,371	138,926
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	50,015	65,344
Other long-term assets	72,075	65,573
Total	122,090	130,917
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	2,350	2,614
Other long-term assets	3,931	5,395
Total	$ 6,281	$ 8,009