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Long-Term Debt and Credit Facilities (Details)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2011
USD ($)
May 31, 2011
USD ($)
Nov. 30, 2011
HSBC Merchant Services LLP [Member]
Nov. 30, 2011
Unsecured Term Loan [Member]
USD ($)
Nov. 30, 2010
Unsecured Term Loan [Member]
USD ($)
Aug. 31, 2008
Unsecured Term Loan [Member]
USD ($)
Nov. 30, 2011
Unsecured Term Loan [Member]
USD ($)
Nov. 30, 2010
Term Loan USD and GBP [Member]
GBP (£)
Aug. 31, 2009
Term Loan USD and GBP [Member]
GBP (£)
Nov. 30, 2011
Term Loan USD and GBP [Member]
USD ($)
Nov. 30, 2011
Term Loan USD and GBP [Member]
GBP (£)
Nov. 30, 2011
Term Loan USD and GBP [Member]
United States of America, Dollars
USD ($)
Nov. 30, 2011
Notes Payable [Member]
UCS [Member]
Nov. 30, 2011
Term Loan [Member]
Minimum [Member]
Nov. 30, 2011
Term Loan [Member]
Maximum [Member]
Nov. 30, 2011
UNITED KINGDOM
USD ($)
May 31, 2011
UNITED KINGDOM
USD ($)
Nov. 30, 2011
HONG KONG
USD ($)
May 31, 2011
HONG KONG
USD ($)
Nov. 30, 2011
CANADA
USD ($)
May 31, 2011
CANADA
USD ($)
Nov. 30, 2011
MALAYSIA
USD ($)
May 31, 2011
MALAYSIA
USD ($)
Nov. 30, 2011
SPAIN
USD ($)
May 31, 2011
SPAIN
USD ($)
Nov. 30, 2011
SINGAPORE
USD ($)
May 31, 2011
SINGAPORE
USD ($)
Nov. 30, 2011
PHILIPPINES
USD ($)
May 31, 2011
PHILIPPINES
USD ($)
Nov. 30, 2011
MALDIVES
USD ($)
May 31, 2011
MALDIVES
USD ($)
Nov. 30, 2011
MACAU
USD ($)
May 31, 2011
MACAU
USD ($)
Nov. 30, 2011
SRI LANKA
USD ($)
May 31, 2011
SRI LANKA
USD ($)
Nov. 30, 2011
Corporate Credit Facility [Member]
USD ($)
Debt Instrument [Line Items]                                                                        
Corporate Credit Facility - long-term $ 163,922,000 $ 183,975,000                                                                    
Short-term lines of credit 225,676,000 270,745,000                           78,413,000 108,333,000 82,863,000 73,554,000 7,189,000 18,725,000 17,866,000 17,743,000 16,258,000 17,646,000 9,564,000 17,245,000 6,096,000 9,736,000 2,843,000 3,202,000 2,396,000 2,372,000 2,188,000 2,189,000  
Total lines of credit 389,598,000 454,720,000                                                                    
Notes Payable 13,363,000 14,285,000                                                                    
Term loans 113,899,000 155,759,000   90,000,000     90,000,000     23,900,000 15,200,000                                                  
Current portion 313,638,000 356,547,000                                                                    
Long-term debt 203,222,000 268,217,000                                                                    
Total debt 516,860,000 624,764,000                                                                    
Line of Credit                                                                        
Lines of credit facilities, available borrowings 925,900,000                                                                     436,100,000
Term Loans                                                                        
Term loan terms             5 years                                                          
Interest rate       1.26%     1.26%     2.25% 2.25%                                                  
Term loan borrowing capacity       200,000,000     200,000,000     300,000,000 43,500,000 230,000,000                                                
Remaining interest in the LLP     49.00%                                                                  
Term loan, quarterly principal payments       $ 15,000,000 $ 10,000,000 $ 5,000,000   £ 3,300,000 £ 2,200,000                                                      
Notes Payable [Abstract]                                                                        
Interest rate, range, minimum                         8.00%                                              
Interest rate, range, maximum                         10.00%                                              
Leverage ratio                           3.25 1.00                                          
Fixed coverage ratio                           2.50 1.00