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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Assets measured at fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Liabilities:    
Contingent earnout liability $ 11,160 $ 14,879
Total Measure at Fair Value | Recurring basis    
Short-term investments:    
Short-term investments 41,461  
Cash and cash equivalents 284,355  
Investments 82,496  
Other current assets 39,830  
Other assets 2,000  
Total assets measured at fair value 450,142  
Liabilities:    
Contingent earnout liability 11,160  
(Level 1)    
Non-qualified Supplemental Savings Plan    
Assets held in Non-qualified Supplement Savings Plan, at fair value 16,200 $ 13,900
(Level 1) | Recurring basis    
Short-term investments:    
Short-term investments 22,443  
Cash and cash equivalents 284,355  
Investments 82,496  
Other current assets 39,830  
Other assets 2,000  
Total assets measured at fair value 431,124  
(Level 2) | Recurring basis    
Short-term investments:    
Short-term investments 19,018  
Total assets measured at fair value 19,018  
(Level 3) | Recurring basis    
Liabilities:    
Contingent earnout liability 11,160  
Certificates of deposit | Total Measure at Fair Value | Recurring basis    
Short-term investments:    
Short-term investments 1,500  
Certificates of deposit | (Level 2) | Recurring basis    
Short-term investments:    
Short-term investments 1,500  
Corporate and municipal debt securities | Total Measure at Fair Value | Recurring basis    
Short-term investments:    
Short-term investments 17,518  
Corporate and municipal debt securities | (Level 2) | Recurring basis    
Short-term investments:    
Short-term investments 17,518  
U.S. government and federal agency securities | Total Measure at Fair Value | Recurring basis    
Short-term investments:    
Short-term investments 22,443  
U.S. government and federal agency securities | (Level 1) | Recurring basis    
Short-term investments:    
Short-term investments $ 22,443