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Available-for-sale investments - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2011
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Gross unrealized gains on available-for-sale investments | $ 60,700,000 | $ 66,300,000 | |
| Gross unrealized losses on available-for-sale investments | 218,000 | 33,000 | |
| Proceeds from maturities or sales of available-for-sale securities | 103,600,000 | 131,700,000 | 173,500,000 |
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Available for sale Securities Current | Chemo Centryx, Inc.
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| 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 | $ 1,500,000 | $ 1,100,000 | |
| Percentage of ownership interest in investment | 15.00% | ||
| X | ||||||||||
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- Definition
Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. No definition available.
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- Definition
Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. No definition available.
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- Definition
Percentage Of Ownership Interests No definition available.
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- Definition
Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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