Fair Value Measurements - Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	May 10, 2014	Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-For-Sale Marketable Securities, Fair Value	$ 86,007	$ 82,161
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	17,717	16,410
Other long-term assets	68,290	65,751
Available-For-Sale Marketable Securities, Fair Value	86,007	82,161
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	17,678	16,386
Other long-term assets	50,328	49,011
Available-For-Sale Marketable Securities, Fair Value	68,006	65,397
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets	39	24
Other long-term assets	17,962	16,740
Available-For-Sale Marketable Securities, Fair Value	18,001	16,764
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current assets
Other long-term assets
Available-For-Sale Marketable Securities, Fair Value