Annual report pursuant to Section 13 and 15(d)

Available-For-Sale Investments - Additional Information (Detail)

v2.4.0.8
Available-For-Sale Investments - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]      
Gross unrealized gains on available-for-sale investments $ 7.6 $ 60.7  
Gross unrealized losses on available-for-sale investments   0.2  
Proceeds from maturities or sales of available-for-sale securities 290 104 132
Available for sale Securities Current | Chemo Centryx, Inc.
     
Schedule of Available-for-sale Securities [Line Items]      
Warrants to purchase common stock shares 150,000    
Warrants price per share 20    
Fair value of the warrants $ 0.6 $ 1.5  
Percentage of ownership interest in investment 14.00%