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PENSION PLANS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 11.8 $ 9.3 $ 35.4 $ 28.0
Interest cost 18.7 19.0 56.1 57.0
Expected return on plan assets (19.7) (19.9) (59.1) (59.7)
Net amortization 13.2 5.9 39.6 17.6
Pension expense $ 24.0 $ 14.3 $ 72.0 $ 42.9