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Remaining Annual Principal Payments of Credit Obligations (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Line Of Credit Facility [Line Items]    
Year 1 $ 20,000  
Year 2 23,834  
Year 3 20,000  
Year 4 62,667  
Year 5 345,000  
Total 471,501  
Term Loans    
Line Of Credit Facility [Line Items]    
Year 1 20,000  
Year 2 20,000  
Year 3 20,000  
Year 4 20,000  
Total 80,000 $ 85,000
Yen Line of Credit    
Line Of Credit Facility [Line Items]    
Year 4 2,667  
Total 2,667 2,679
U.S. Dollar Line of Credit    
Line Of Credit Facility [Line Items]    
Year 4 40,000  
Total 40,000 $ 252,000
Note Payable    
Line Of Credit Facility [Line Items]    
Year 2 3,834  
Total 3,834  
Convertible Notes    
Line Of Credit Facility [Line Items]    
Year 5 345,000  
Total $ 345,000