Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details Textual)

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Borrowings (Details Textual) - Apr. 30, 2012 - USD ($)
Total
Debt Instrument [Line Items]  
Derivative fixed average interest rate 2.80%
LIBOR [Member]  
Debt Instrument [Line Items]  
Floating LIBOR rate debt $ 500,000,000