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PROPERTY AND EQUIPMENT - Summary of PP&E (Details)
$ in Thousands, ft² in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
a
ft²
Feb. 29, 2016
USD ($)
a
ft²
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
Feb. 29, 2016
USD ($)
a
ft²
Feb. 28, 2015
USD ($)
Feb. 28, 2014
USD ($)
PROPERTY AND EQUIPMENT              
Property and equipment, gross $ 224,391 $ 224,391     $ 224,391 $ 208,222  
Less accumulated depreciation (93,926) (93,926)     (93,926) (82,154)  
Property and equipment, net 130,465 130,465     130,465 126,068  
Depreciation expense         14,980 14,330 $ 12,230
Capital expenditures for property and equipment         19,500 5,360 40,120
Rent expense related to operating leases         5,860 5,010 5,680
Asset impairment charges   3,000 $ 3,000 $ 9,000 6,000 9,000 $ 12,049
Southhaven, Mississippi facility              
PROPERTY AND EQUIPMENT              
Capital expenditures for property and equipment         1,650    
Olive Branch, Mississippi distribution facility              
PROPERTY AND EQUIPMENT              
Capital expenditures for property and equipment           34,030  
Land              
PROPERTY AND EQUIPMENT              
Property and equipment, gross $ 12,800 $ 12,800     $ 12,800 12,800  
Land | Olive Branch, Mississippi distribution facility              
PROPERTY AND EQUIPMENT              
Area (in square feet or acres) | a 84 84     84    
Building and improvements              
PROPERTY AND EQUIPMENT              
Property and equipment, gross $ 108,509 $ 108,509     $ 108,509 102,058  
Building and improvements | Minimum              
PROPERTY AND EQUIPMENT              
Estimated useful life         3 years    
Building and improvements | Maximum              
PROPERTY AND EQUIPMENT              
Estimated useful life         40 years    
Building and improvements | Olive Branch, Mississippi distribution facility              
PROPERTY AND EQUIPMENT              
Area (in square feet or acres) | ft² 1.3 1.3     1.3    
Computer, furniture and other equipment              
PROPERTY AND EQUIPMENT              
Property and equipment, gross $ 70,778 $ 70,778     $ 70,778 64,464  
Computer, furniture and other equipment | Minimum              
PROPERTY AND EQUIPMENT              
Estimated useful life         3 years    
Computer, furniture and other equipment | Maximum              
PROPERTY AND EQUIPMENT              
Estimated useful life         15 years    
Tools, dies, molds and other production equipment              
PROPERTY AND EQUIPMENT              
Property and equipment, gross 28,254 28,254     $ 28,254 25,861  
Tools, dies, molds and other production equipment | Minimum              
PROPERTY AND EQUIPMENT              
Estimated useful life         1 year    
Tools, dies, molds and other production equipment | Maximum              
PROPERTY AND EQUIPMENT              
Estimated useful life         10 years    
Construction in progress              
PROPERTY AND EQUIPMENT              
Property and equipment, gross 4,050 $ 4,050     $ 4,050 $ 3,039  
Venezuela              
PROPERTY AND EQUIPMENT              
Asset impairment charges 9,160            
Venezuela | Property and equipment              
PROPERTY AND EQUIPMENT              
Asset impairment charges $ 80