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Summary by Level of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Liabilities:    
0.25% convertible notes $ 384,000  
Fair Value, Measurements, Recurring    
Assets:    
Foreign currency forward contracts 218 $ 191
Liabilities:    
Contingent earnout arrangements 5,795 5,795
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets:    
Foreign currency forward contracts 218 191
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities:    
Contingent earnout arrangements 5,795 $ 5,795
Fair Value, Measurements, Recurring | Convertible Notes    
Liabilities:    
0.25% convertible notes 384,000  
Fair Value, Measurements, Recurring | Convertible Notes | Fair Value, Inputs, Level 2    
Liabilities:    
0.25% convertible notes $ 384,000