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Borrowings (Details Textual 1) (USD $)
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0 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2012
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Apr. 30, 2012
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Mar. 31, 2012
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May 31, 2014
Cash flow hedging [Member]
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May 31, 2013
Cash flow hedging [Member]
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May 31, 2014
Interest rate swap contracts [Member]
Cash flow hedging [Member]
Interest Expense [Member]
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May 31, 2013
Interest rate swap contracts [Member]
Cash flow hedging [Member]
Interest Expense [Member]
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May 31, 2014
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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Feb. 28, 2014
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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Apr. 30, 2012
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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May 31, 2014
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
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Feb. 28, 2014
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
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Apr. 30, 2012
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
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| Derivative [Line Items] | |||||||||||||
| Variable rate basis on interest rate swap agreements | one-month LIBOR base rate | three-month LIBOR base rate | |||||||||||
| Notional value of interest rate swap agreements | $ 500,000,000 | $ 500,000,000 | $ 500,000,000.0 | $ 1,000,000,000 | $ 1,000,000,000.0 | $ 500,000,000.0 | |||||||
| Derivative fixed average interest rate | 2.80% | ||||||||||||
| Net losses reclassified from AOCI to interest expense, net | $ (500,000) | $ (1,000,000) | $ (2,000,000) | $ (2,100,000) | |||||||||