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Schedule of Acquisition of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2014
Westerman, Inc
 
Business Acquisition [Line Items]  
Total acquired identifiable intangible assets $ 18,318
Westerman, Inc | Customer Relationships
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 12,796
Useful Life (Years) 10 years
Westerman, Inc | Trade Names
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 2,986
Westerman, Inc | Trade Names | Minimum
 
Business Acquisition [Line Items]  
Useful Life (Years) 3 years
Westerman, Inc | Trade Names | Maximum
 
Business Acquisition [Line Items]  
Useful Life (Years) 4 years
Westerman, Inc | Non-compete Agreements
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 1,050
Useful Life (Years) 5 years
Westerman, Inc | Other Intangible Assets
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 1,486
Westerman, Inc | Other Intangible Assets | Minimum
 
Business Acquisition [Line Items]  
Useful Life (Years) 1 year
Westerman, Inc | Other Intangible Assets | Maximum
 
Business Acquisition [Line Items]  
Useful Life (Years) 3 years
Steffes
 
Business Acquisition [Line Items]  
Total acquired identifiable intangible assets 10,290
Steffes | Trade Names
 
Business Acquisition [Line Items]  
Acquired indefinite lived intangible assets 290
Steffes | Customer Relationships
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 10,000
Useful Life (Years) 9 years
Steffes | Trade Names | Maximum
 
Business Acquisition [Line Items]  
Useful Life (Years) 1 year
Palmer Mfg. And Tank, Inc
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 39,494
Total acquired identifiable intangible assets 39,494
Palmer Mfg. And Tank, Inc | Customer Relationships
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 25,730
Useful Life (Years) 8 years
Palmer Mfg. And Tank, Inc | Trade Names
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 8,406
Useful Life (Years) 5 years
Palmer Mfg. And Tank, Inc | Non-compete Agreements
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 5,208
Useful Life (Years) 5 years
Palmer Mfg. And Tank, Inc | Other Intangible Assets
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 150
Useful Life (Years) 3 years
Worthington Aritas
 
Business Acquisition [Line Items]  
Total acquired identifiable intangible assets 16,800
Worthington Aritas | Customer Relationships
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 8,400
Useful Life (Years) 10 years
Worthington Aritas | Trade Names
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 180
Useful Life (Years) 2 years
Worthington Aritas | Non-compete Agreements
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 120
Useful Life (Years) 3 years
Worthington Aritas | Technological know-how
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 8,100
Useful Life (Years) 20 years
TWB
 
Business Acquisition [Line Items]  
Total acquired identifiable intangible assets 22,028
TWB | Trade Names
 
Business Acquisition [Line Items]  
Acquired indefinite lived intangible assets 4,120
TWB | Customer Relationships
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets 17,438
TWB | Customer Relationships | Minimum
 
Business Acquisition [Line Items]  
Useful Life (Years) 5 years
TWB | Customer Relationships | Maximum
 
Business Acquisition [Line Items]  
Useful Life (Years) 6 years
TWB | Non-compete Agreements
 
Business Acquisition [Line Items]  
Acquired finite lived intangible assets $ 470
Useful Life (Years) 5 years