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Fair Value Measurements, Marketable Securities and Variable Interest Entities - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Security
Jun. 30, 2017
USD ($)
Security
Jun. 30, 2016
USD ($)
Security
Jun. 30, 2015
USD ($)
Schedule of Money Market Funds and Variable Interest Entities [Line Items]        
Marketable securities $ 0 $ 0 $ 0  
Realized gains (losses) from sales of securities   $ 0 $ 0 $ 0
Number of securities hold maturity greater than one year | Security 0 0 0  
Impairment of investment   $ 2,500,000    
VIE not primary beneficiary [Member]        
Schedule of Money Market Funds and Variable Interest Entities [Line Items]        
Interest at cost before impairment $ 2,500,000 2,500,000    
Maximum exposure to loss as a result of investment in privately held entity 0 0    
VIE not primary beneficiary [Member] | Other assets, noncurrent [Member]        
Schedule of Money Market Funds and Variable Interest Entities [Line Items]        
Interest recognized at cost     $ 2,500,000  
VIE not primary beneficiary [Member] | Other (expense) income, net [Member]        
Schedule of Money Market Funds and Variable Interest Entities [Line Items]        
Impairment of investment 2,500,000      
Money market funds [Member]        
Schedule of Money Market Funds and Variable Interest Entities [Line Items]        
Cash and cash equivalents $ 10,300,000 $ 10,300,000 $ 20,200,000