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Description of business and summary of significant accounting policies - Additional Information (Detail) (USD $)
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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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| Significant Accounting Policies [Line Items] |
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| Advertising expenses (including production and communication costs) |
$ 3,400,000 |
$ 2,900,000 |
$ 3,000,000 |
| Available-for-sale investments, maturities start |
3 months |
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| Available-for-sale investments, maturities end |
3 years |
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| Goodwill |
85,682,000 |
86,633,000 |
25,068,000 |
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Equipment
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| Significant Accounting Policies [Line Items] |
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| Property, plant and equipment useful life |
5 years |
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Building, Building Improvements and Leasehold Improvements | Minimum
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| Significant Accounting Policies [Line Items] |
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| Property, plant and equipment useful life |
5 years |
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Building, Building Improvements and Leasehold Improvements | Maximum
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| Significant Accounting Policies [Line Items] |
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| Property, plant and equipment useful life |
40 years |
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Proteins and Antibodies
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| Significant Accounting Policies [Line Items] |
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| Manufacturing costs for proteins and antibodies |
$ 13,300,000 |
$ 13,700,000 |
$ 12,300,000 |