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Nonpension Postretirement Benefits (Narrative) (Details) (Nonpension Postretirement Benefit Plans, USD $)
 0 Months Ended
Jan. 02, 2013
Nonpension Postretirement Benefit Plans
  
Defined Benefit Plan Disclosure [Line Items]  
Retirees Subject to Health Reimbursement Arrangement, Minimum Age 65 years
Defined benefit plan, life insurance benefit, maximum $ 10,000lby_DefinedBenefitPlanLifeInsuranceBenefitMaximum
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