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Fair Value (Details) (Fair Value, Inputs, Level 3 [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Oct. 31, 2013
Fair Value, Inputs, Level 3 [Member]
 
Balance, May 1, 2013 $ (1,046)
Transfers to (from) Level 3 0
Total gains (losses) included in earnings (2,048)
Purchases, issuances and settlements, net 0
Balance, October 31, 2013 $ (3,094)