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Acquisitions and Divestitures - ZEE Assets and Liabilities Assumed (Details) - USD ($)
$ in Thousands
May 31, 2016
Aug. 01, 2015
May 31, 2015
May 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 1,291,593   $ 1,195,612 $ 1,267,411
ZEE        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 333    
Accounts receivable   16,705    
Inventory   5,987    
Other current assets   1,443    
Property, plant and equipment   849    
Goodwill   86,392    
Accounts payable   (7,195)    
Accrued liabilities   (4,428)    
Deferred income taxes   (4,586)    
Total consideration   134,000    
ZEE | Service Contracts        
Business Acquisition [Line Items]        
Intangible assets other than goodwill   34,000    
ZEE | Other Intangibles        
Business Acquisition [Line Items]        
Intangible assets other than goodwill   $ 4,500