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Available-for-sale investments - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2010 | Sep. 30, 2011 Available for sale Securities Non Current Chemo Centryx, Inc. | Jun. 30, 2011 Available for sale Securities Non Current Chemo Centryx, Inc. Preferred Stock | Feb. 08, 2012 Available for sale Securities Current [Member] Chemo Centryx, Inc. | Jun. 30, 2012 Available for sale Securities Current [Member] Chemo Centryx, Inc.
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 |  |  |  |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 22 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 4 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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