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Commitments and contingencies - 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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| Schedule of Operating Leases [Line Items] | |||
| Rent Expense | $ 793,000 | $ 416,000 | $ 326,000 |