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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 21, 2018
Aug. 14, 2018
Aug. 31, 2019
Aug. 31, 2018
May 31, 2019
Business Acquisition [Line Items]          
Contingent consideration, liabilities     $ 11,830   $ 13,486
Other long-term liabilities     3,800   521
Accrued liabilities     22,693   38,338
Acquisition, restructuring and other items, net     $ 1,500 $ 4,422  
Minimum          
Business Acquisition [Line Items]          
Useful life     2 years    
Maximum          
Business Acquisition [Line Items]          
Useful life     18 years    
RadiaDyne          
Business Acquisition [Line Items]          
Aggregate purchase price $ 75,000        
Payments to acquire business 47,900        
Contingent consideration, liabilities 22,300        
Other long-term liabilities 4,600   $ 4,600    
Accrued liabilities $ 200        
Acquisition, restructuring and other items, net         1,600
RadiaDyne | Customer relationships          
Business Acquisition [Line Items]          
Useful life 15 years        
RadiaDyne | Minimum | Trademark          
Business Acquisition [Line Items]          
Useful life 5 years        
RadiaDyne | Minimum | Product technology          
Business Acquisition [Line Items]          
Useful life 7 years        
RadiaDyne | Maximum | Trademark          
Business Acquisition [Line Items]          
Useful life 7 years        
RadiaDyne | Maximum | Product technology          
Business Acquisition [Line Items]          
Useful life 10 years        
RadiaDyne | Revenue milestones          
Business Acquisition [Line Items]          
Contingent consideration, liabilities $ 16,500        
RadiaDyne | Technical milestones          
Business Acquisition [Line Items]          
Contingent consideration, liabilities $ 5,800        
BioSentry          
Business Acquisition [Line Items]          
Aggregate purchase price   $ 39,800      
Payments to acquire business   37,000      
Contingent consideration, liabilities   $ 2,800      
Acquisition related costs         $ 1,000
BioSentry | Trademark          
Business Acquisition [Line Items]          
Useful life   15 years      
BioSentry | Customer relationships          
Business Acquisition [Line Items]          
Useful life   10 years