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PENSION PLANS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost $ 11.8 $ 9.3
Interest cost 18.7 19.0
Expected return on plan assets (19.7) (19.9)
Net amortization 13.2 5.9
Pension expense $ 24.0 $ 14.3