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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Options outstanding, shares    
Beginning Balance 1,306,000  
Granted 130,000 0
Exercised 0  
Forfeited/Expired 0  
Ending Balance 1,436,000  
Exercisable as of September 30, 2015 351,000  
Expected to vest as of September 30, 2015 1,035,000  
Total 1,386,000  
Weighted Average Exercise Price Per Share    
Beginning Balance $ 120.62  
Granted 201.25  
Exercised 0.00  
Forfeited/Expired 0.00  
Ending Balance 127.91  
Exercisable as of September 30, 2015 103.09  
Expected to vest as of September 30, 2015 138.03  
Total $ 129.18  
Aggregate Intrinsic Value    
Exercised $ 0  
Exercisable as of September 30, 2015 32,800  
Expected to vest as of September 30, 2015 61,105  
Total $ 93,904  
Weighted Average Remaining Contractual Term (Years)    
Exercisable as of September 30, 2015 7 years 7 months 6 days  
Expected to vest as of September 30, 2015 8 years 9 months 18 days  
Total 8 years 6 months