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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
Mar. 01, 2012
Jan. 24, 2012
Pension
   
Pension and Other Postretirement Benefits    
Reduction in the net recorded liability $ 33.4  
Union pension plan
   
Pension and Other Postretirement Benefits    
Reduction in the net recorded liability $ 30.2  
Discount rate (as a percent)   4.54%