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Pension Benefit and Other Postretirement Benefit Plans (Estimated Future Payments) (Details) (Pension Benefits [Member], USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Pension Benefits [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2014 $ 8,441 [1]
2015 8,029 [1]
2016 8,209 [1]
2017 8,303 [1]
2018 8,595 [1]
2019-2023 $ 48,629 [1]
[1] This calculation was performed as of April 30, 2013 due to the pension freeze and we are not otherwise required to perform the calculation at interim periods