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Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Expense (Income) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 6,229  
Expense/ (Income) 907  
Payments (821)  
Adjustments     
Ending Balance 6,315  
Less: joint venture transactions (142) 1,162
Restructuring and other expense (income) (3,997) 403
ITS
   
Restructuring Cost and Reserve [Line Items]    
Gain on asset disposal (4,762)  
Early Retirement And Severance
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 5,029  
Expense/ (Income) 402  
Payments (441)  
Adjustments     
Ending Balance 4,990  
Facility Exit And Other Costs
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 1,200  
Expense/ (Income) 505  
Payments (380)  
Adjustments     
Ending Balance $ 1,325