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Available-for-sale investments - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | ||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2010
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Sep. 30, 2011
Available for sale Securities Non Current
Chemo Centryx, Inc.
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Jun. 30, 2011
Available for sale Securities Non Current
Chemo Centryx, Inc.
Preferred Stock
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Feb. 08, 2012
Available for sale Securities Current [Member]
Chemo Centryx, Inc.
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Jun. 30, 2012
Available for sale Securities Current [Member]
Chemo Centryx, Inc.
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| Schedule of Available-for-sale Securities [Line Items] | |||||||
| Gross unrealized gains on available-for-sale investments | $ 66,300,000 | $ 1,100,000 | |||||
| Gross unrealized losses on available-for-sale investments | 33,000 | 58,000 | |||||
| Investment in Preferred Stock of CCXI | 14,300,000 | ||||||
| Notes Receivable | 10,000,000 | ||||||
| Commitment to participate in private placement of CCX shares | 5,000,000 | ||||||
| Initial public offering, per share | $ 10 | ||||||
| Additional investment in private placement | 147,011,000 | 151,366,000 | 176,621,000 | 5,000,000 | |||
| Warrants to purchase common stock shares, term | 10 years | ||||||
| Warrants to purchase common stock shares | 150,000 | ||||||
| Warrants price per share | 20 | ||||||
| Percentage of ownership interest in investment | 18.00% | ||||||
| Proceeds from maturities or sales of available-for-sale securities | $ 131,700,000 | $ 173,500,000 | $ 66,600,000 | ||||
| X | ||||||||||
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- Definition
Commitments To Participate In Private Placement Upon Successful Public Offering No definition available.
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| X | ||||||||||
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- Definition
Common Stock Warrants Outstanding No definition available.
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| X | ||||||||||
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- Definition
Common Stock Warrants, Term No definition available.
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| X | ||||||||||
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- Definition
Notes Receivable Face Value No definition available.
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| X | ||||||||||
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- Definition
Percentage Of Ownership Interests No definition available.
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| X | ||||||||||
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- Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. No definition available.
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| X | ||||||||||
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- Definition
The exercise price of each class of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount per share assigned to the consideration received for shares issued. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Details
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