XML 38 R43.htm IDEA: XBRL DOCUMENT v2.4.0.8
Debt (Details 4) (USD $)
May 31, 2013
Debt Instrument [Line Items]  
Limit on additional debt borrowings $ 353,290,000
Fixed rate Senior Notes | Book value
 
Debt Instrument [Line Items]  
Fixed rate debt 100,000,000
Fixed rate Senior Notes | Fair Value, Level 2 | Discounted cash flow analysis
 
Debt Instrument [Line Items]  
Fixed rate debt $ 105,180,000