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Financial Instruments and Fair Value Measurement - Assets measured at fair value and Supplemental fair value information (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Mar. 19, 2015
Supplemental fair value information about long-term fixed-rate debt      
Carrying value of long-term fixed-rate debt $ 492,637 $ 491,847  
Unsecured senior notes issued March 19, 2015      
Supplemental fair value information about long-term fixed-rate debt      
Debt issued 500,000   $ 500,000
Recurring basis      
Short-term investments:      
Short-term investments 39,894    
Assets:      
Cash and cash equivalents 572,787    
Investments 63,380    
Other current assets 32,917    
Other assets 6,690    
Total assets measured at fair value 715,668    
Liabilities:      
Contingent earnout liability 14,509    
Carrying value      
Supplemental fair value information about long-term fixed-rate debt      
Carrying value of long-term fixed-rate debt 492,600 491,800  
(Level 1) | Recurring basis      
Short-term investments:      
Short-term investments 17,419    
Assets:      
Cash and cash equivalents 572,787    
Investments 63,380    
Other current assets 32,667    
Other assets 6,690    
Total assets measured at fair value 692,943    
(Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 22,475    
Assets:      
Other current assets 250    
Total assets measured at fair value 22,725    
(Level 2) | Total Measure at Fair Value      
Supplemental fair value information about long-term fixed-rate debt      
Fair value of long-term fixed-rate debt 527,200 $ 529,600  
(Level 3) | Recurring basis      
Liabilities:      
Contingent earnout liability 14,509    
Certificate of deposit | Recurring basis      
Short-term investments:      
Short-term investments 4,600    
Certificate of deposit | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 4,600    
Corporate and municipal debt securities | Recurring basis      
Short-term investments:      
Short-term investments 13,877    
Corporate and municipal debt securities | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments 13,877    
U.S. government and federal agency securities | Recurring basis      
Short-term investments:      
Short-term investments 21,417    
U.S. government and federal agency securities | (Level 1) | Recurring basis      
Short-term investments:      
Short-term investments 17,419    
U.S. government and federal agency securities | (Level 2) | Recurring basis      
Short-term investments:      
Short-term investments $ 3,998