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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 26, 2012
May 28, 2011
May 26, 2012
May 28, 2011
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined contribution expense $ 2,900 $ 2,700 $ 8,700 $ 7,900
Defined benefit pension expense $ 500 $ 500 $ 1,600 $ 1,500