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Income taxes - Additional Information (Detail) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2013 USD ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2013 R&D Europe USD ($) | Jun. 30, 2013 R&D Europe GBP (£)
Income Taxes [Line Items] |  |  |  |  |
Federal statutory tax rate | 35.00% |  |  |  |
Dividend declared and paid to Company by subsidiary |  |  |  | $ 30,700,000 | £ 20,000,000
Undistributed earnings of Company's foreign subsidiaries | 144,000,000 |  |  |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized | $ 1,000 | $ 2,000 | $ 3,000 |  |

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