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Intangible assets and goodwill - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Developed Technology Rights | Cost of Sales
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| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization expense of intangible assets | $ 749,000.0 | $ 110,000.0 | $ 1,500,000 | $ 219,000.0 |
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Trade Names Customer Relationships and Noncompete Agreement | Selling, General and Administrative Expense
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| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization expense of intangible assets | $ 519,000.0 | $ 61,000.0 | $ 1,000,000 | $ 122,000.0 |