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Borrowings (Details Textual 1) (USD $)
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0 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2012
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Jun. 30, 2010
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Apr. 30, 2012
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Mar. 31, 2012
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Feb. 28, 2014
Cash flow hedging [Member]
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Feb. 28, 2013
Cash flow hedging [Member]
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Feb. 29, 2012
Cash flow hedging [Member]
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Feb. 28, 2014
Interest rate swap contracts [Member]
Cash flow hedging [Member]
Interest Expense [Member]
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Feb. 28, 2013
Interest rate swap contracts [Member]
Cash flow hedging [Member]
Interest Expense [Member]
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Feb. 29, 2012
Interest rate swap contracts [Member]
Cash flow hedging [Member]
Interest Expense [Member]
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Feb. 28, 2014
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
|
Feb. 28, 2013
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
|
Apr. 30, 2012
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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Sep. 02, 2011
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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Jun. 30, 2010
Designated as hedging instrument [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
|
Feb. 28, 2014
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
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Feb. 28, 2013
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
|
Apr. 30, 2012
Not designated as hedging instrument [Member]
Interest rate swap contracts [Member]
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| Derivative [Line Items] | ||||||||||||||||||
| Length of delayed start interest rate swap agreement, years | 5 years | |||||||||||||||||
| Notional value of interest rate swap agreements | $ 500,000,000 | $ 500,000,000.0 | $ 500,000,000 | $ 500,000,000.0 | $ 500,000,000.0 | $ 1,000,000,000 | $ 1,000,000,000.0 | $ 500,000,000 | ||||||||||
| Derivative fixed average interest rate | 2.80% | 2.90% | ||||||||||||||||
| Variable rate basis on interest rate swap agreements | one-month LIBOR base rate | three-month LIBOR base rate | ||||||||||||||||
| Net losses reclassified from AOCI to interest expense, net | $ (4,000,000) | $ (3,100,000) | $ 4,200,000 | $ (8,200,000) | $ (8,000,000) | $ (3,800,000) | ||||||||||||