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SEGMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
May 31, 2014
Country
May 31, 2013
May 31, 2014
Country
May 31, 2013
Aug. 31, 2013
May 31, 2014
United States Operations
May 31, 2013
United States Operations
Aug. 31, 2013
United States Operations
May 31, 2014
Latin American Operations
May 31, 2013
Latin American Operations
Aug. 31, 2013
Latin American Operations
May 31, 2014
Caribbean Operations
May 31, 2013
Caribbean Operations
Aug. 31, 2013
Caribbean Operations
May 31, 2014
Reconciling Items
May 31, 2013
Reconciling Items
Aug. 31, 2013
Reconciling Items
Aug. 31, 2013
Scenario, Previously Reported [Member]
May 31, 2013
Scenario, Previously Reported [Member]
Feb. 28, 2013
Scenario, Previously Reported [Member]
Nov. 30, 2012
Scenario, Previously Reported [Member]
May 31, 2013
Scenario, Previously Reported [Member]
Aug. 31, 2013
Scenario, Previously Reported [Member]
May 31, 2013
Scenario, Previously Reported [Member]
United States Operations
Aug. 31, 2013
Scenario, Previously Reported [Member]
United States Operations
May 31, 2013
Scenario, Previously Reported [Member]
Latin American Operations
Aug. 31, 2013
Scenario, Previously Reported [Member]
Latin American Operations
May 31, 2013
Scenario, Previously Reported [Member]
Caribbean Operations
Aug. 31, 2013
Scenario, Previously Reported [Member]
Caribbean Operations
May 31, 2013
Scenario, Adjustment [Member]
United States Operations
Aug. 31, 2013
Scenario, Adjustment [Member]
United States Operations
May 31, 2013
Scenario, Adjustment [Member]
Latin American Operations
Aug. 31, 2013
Scenario, Adjustment [Member]
Latin American Operations
May 31, 2013
Scenario, Adjustment [Member]
Caribbean Operations
Aug. 31, 2013
Scenario, Adjustment [Member]
Caribbean Operations
May 31, 2013
Scenario, Actual [Member]
Aug. 31, 2013
Scenario, Actual [Member]
May 31, 2013
Scenario, Actual [Member]
United States Operations
Aug. 31, 2013
Scenario, Actual [Member]
United States Operations
May 31, 2013
Scenario, Actual [Member]
Latin American Operations
Aug. 31, 2013
Scenario, Actual [Member]
Latin American Operations
May 31, 2013
Scenario, Actual [Member]
Caribbean Operations
Aug. 31, 2013
Scenario, Actual [Member]
Caribbean Operations
Segment Reporting Information [Line Items]                                                                                      
Gain (Loss) on Disposition of Assets $ (558) $ (249) $ (746) $ (353) $ (889)                         $ (536) $ (249) $ (47) $ (57)   $ (889)             $ 0 $ 0 $ (297) $ (637) $ (56) $ (252)                
Number of countries and territories 13   13                                                                                
Segment Reporting Information                                                                                      
Revenue from external customers 615,037 571,722 1,895,012 1,714,418   19,062 15,620   1,280,311 1,147,275   595,639 551,523     0                                                      
Intersegment revenues     0 0   738,579 659,166   0 0   4,030 3,565   (742,609) [1] (662,731)                                                      
Depreciation and amortization 7,139 6,228 20,932 17,943   1,701 1,552   12,466 9,737   6,765 6,654                                                            
Operating income 31,203 28,489 102,937 94,606   29,113 25,103   54,596 52,854   19,228 16,649                 94,959 127,935 25,103 34,132 53,151 70,383 16,705 23,420             94,606 127,046 25,103 34,132 52,854 69,746 16,649 23,168
Net income 21,320 18,539 71,030 63,426   19,085 17,628   37,676 34,404   14,269 11,394                                                            
Property, Plant and Equipment, Additions     82,774 52,383   4,869 322   70,682 46,517   7,223 5,544                                                            
Long-lived assets (other than deferred tax assets) 494,443 428,650 494,443 428,650 437,587 14,272 16,559 19,114 365,903 295,967 304,731 114,268 116,124 113,742 0 [1] 0 0 [1]                                                    
Goodwill 36,176 36,622 36,176 36,622 36,364 0 0 0 31,430 31,683 31,474 4,746 4,939 4,890 0 [1] 0 0 [1]                                                    
Identifiable assets $ 898,451 $ 792,494 $ 898,451 $ 792,494 $ 826,039 $ 77,648 $ 76,730 $ 103,844 $ 602,365 $ 508,798 $ 518,313 $ 218,438 $ 206,966 $ 203,882 $ 0 [1] $ 0 $ 0 [1]                                                    
[1] (1) The reconciling items reflect the amount eliminated on consolidation of intersegment transactions.