Fair Value Measurements - Company's Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	May 04, 2013	Aug. 25, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term marketable securities	$ 21,522	$ 22,515
Long-term marketable securities	61,141	53,699
Total	82,663	76,214
Contingent consideration	(23,533)
Derivative instruments		(4,915)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term marketable securities	21,522	22,515
Long-term marketable securities	45,053	40,424
Total	66,575	62,939
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term marketable securities	16,088	13,275
Total	16,088	13,275
Derivative instruments		(4,915)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (23,533)