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Pensions and Other Postretirement Benefits (Details 8) - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Changes in plan assets:    
Fair value of plan assets at beginning of year $ 15.0 $ 15.0
Big Heart pension assets acquired 2.8 0.0
Actual return on plan assets still held at reporting date 0.7 0.0
Fair value of plan assets at end of year $ 18.5 $ 15.0