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	Feb. 09, 2013	Aug. 25, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term marketable securities	$ 15,028	$ 22,515
Long-term marketable securities	67,175	53,699
Total	82,203	76,214
Contingent consideration	(23,005)
Derivative instruments		(4,915)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term marketable securities	15,028	22,515
Long-term marketable securities	50,395	40,424
Total	65,423	62,939
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term marketable securities	16,780	13,275
Total	16,780	13,275
Derivative instruments		(4,915)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (23,005)