Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details Textual 1)

v3.7.0.1
Borrowings (Details Textual 1) - USD ($)
May 31, 2017
Feb. 28, 2017
Debt Instrument [Line Items]    
Derivative fixed average interest rate 1.10%  
LIBOR [Member]    
Debt Instrument [Line Items]    
Floating LIBOR rate debt $ 250,000,000.0  
Interest rate swap contracts [Member] | Designated as hedging instrument [Member]    
Debt Instrument [Line Items]    
Aggregate notional value of derivative instruments 250,000,000 $ 250,000,000
Interest rate swap contracts [Member] | Designated as hedging instrument [Member] | Cash flow hedging [Member]    
Debt Instrument [Line Items]    
Aggregate notional value of derivative instruments $ 250,000,000.0