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Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2013 $ 30.2
2014 28.1
2015 21.6
2016 20.0
2017 $ 19.6