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Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 24, 2012	Nov. 26, 2011
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution expense	$ 4,300	$ 2,800
Defined benefit pension expense	$ 600	$ 500

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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