Derivative Financial Instruments and Risk Management (Narrative) (Details) (USD $)	9 Months Ended
Jan. 31, 2015
Derivative Financial Instruments And Risk Management 1	$ 1,000,000
Derivative Financial Instruments And Risk Management 2	61,294
Derivative Financial Instruments And Risk Management 3	$ 12,119

Derivative Financial Instruments And Risk Management 1

No definition available.

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