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Debt (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Dec. 05, 2012
Feb. 28, 2014
Feb. 28, 2014
Feb. 28, 2014
Revolving Credit Facility
May 31, 2013
Revolving Credit Facility
Feb. 28, 2013
Revolving Credit Facility
Feb. 28, 2014
Standby Letter Of Credit
Feb. 28, 2014
Loan Agreement
Feb. 28, 2014
Unsecured Debt
May 31, 2013
Unsecured Debt
Feb. 28, 2013
Unsecured Debt
Feb. 28, 2014
Unsecured Debt
Feb. 28, 2014
Secured Debt [Member]
Feb. 28, 2014
Loan Agreement
Federal Funds Rate [Member]
Feb. 28, 2014
Loan Agreement
Eurodollar [Member]
Feb. 28, 2014
Loan Agreement
Eurodollar [Member]
Minimum
Feb. 28, 2014
Loan Agreement
Base Rate [Member]
Minimum
Feb. 28, 2014
Loan Agreement
Base Rate [Member]
Maximum
Feb. 28, 2014
Loan Agreement
London Interbank Offered Rate (LIBOR) [Member]
Minimum
Feb. 28, 2014
Loan Agreement
London Interbank Offered Rate (LIBOR) [Member]
Maximum
Debt (Details) [Line Items]                                        
Effective Income Tax Rate Reconciliation, Percent   70.40% (312.80%)                                  
Line of Credit Facility, Current Borrowing Capacity   $ 425.0 $ 425.0                                  
Line of Credit Facility, Expiration Date Dec. 05, 2017                                      
Debt Instrument, Basis Spread on Variable Rate                           0.50% 1.00% 0.18% 0.18% 0.60% 1.18% 1.60%
Line of Credit Facility, Fee Percentage Range Minimum   0.20% 0.20%                                  
Line of Credit Facility Fee Percentage Range Maximum   0.40% 0.40%                                  
Line Of Credit Facility Fee Percentage   0.20% 0.20%                                  
Line of Credit Facility, Amount Outstanding       175.0 0 0                            
Standby Letters of Credit   1.0 1.0       5.7 0.4                        
Credit Lines Available                       14.7 34.3              
Line of Credit Facility, Expiration Period                       365 days 364 days              
Credit Lines Borrowed Amount                 $ 4.7 $ 2.0 $ 1.8