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Goodwill and intangible assets - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Cost of Sales |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | $ 890,000 | $ 435,000 | $ 435,000
Selling, General and Administrative Expense |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | $ 574,000 | $ 525,000 | $ 525,000

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