Current report filing

Borrowings (Details Textual 1)

v3.8.0.1
Borrowings (Details Textual 1) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2017
Apr. 30, 2012
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Derivative [Line Items]          
Derivative fixed average interest rate 1.10% 2.80%      
LIBOR [Member]          
Derivative [Line Items]          
Floating LIBOR rate debt $ 250,000,000.0 $ 500,000,000 $ 250,000,000.0    
Cash flow hedging [Member]          
Derivative [Line Items]          
Net losses reclassified from AOCI to interest expense     31,200,000 $ 26,000,000 $ 3,900,000
Interest rate swap contracts [Member] | Cash flow hedging [Member] | Interest expense [Member]          
Derivative [Line Items]          
Net losses reclassified from AOCI to interest expense     4,000,000 8,100,000 $ 8,300,000
Interest rate swap contracts [Member] | Designated as hedging instrument [Member]          
Derivative [Line Items]          
Notional value of interest rate swap agreements 250,000,000   250,000,000 600,000,000  
Interest rate swap contracts [Member] | Designated as hedging instrument [Member] | Cash flow hedging [Member]          
Derivative [Line Items]          
Notional value of interest rate swap agreements 250,000,000.0 500,000,000.0 250,000,000.0    
Interest rate swap contracts [Member] | Not designated as hedging instrument [Member]          
Derivative [Line Items]          
Notional value of interest rate swap agreements $ 0 $ 500,000,000.0 $ 0 $ 1,000,000,000